Okay man normally I don't like to get into arguments but i think what your experiencing is a skill issue
1. I think your over exaggerating about her vision I had plenty of times when I was on her side and she never saw me, I don't know if your running around or not so she can hear you but she doesn't
2. Bella's stomach capacity is 3 she can have 3 students in her stomach before she full, even then she has an animation when she's eating someone your supposed to run in that grace period.
3. Bella being faster than you is the point I have seen a lot of people complain about this but its not that hard to get around Bella prefers apples over you so just hold a apple its better losing a key than being eaten. if a student is nearby use them as a meat shield, even then the more students Bella has in her stomach the slower she is by the time she has 2 she is literally slower than you, and besides would you rather her be slower than you all the time then you would always outrun her and all the mechanics you could use to keep her at bay would be pointless.
4. I honestly don't know what your talking about with Bella seeing you through walls I have beaten her 5 times so far and never encountered such a glitch maybe you were not as hidden as you thought
5. your just unlucky with apples or your just bad at finding them there usually always in an unlocked room or in the cafeteria just be careful rushing down there immediately that's where Bella spawns.
6. the RNG escape system. I have seen so many people complain about this and everyone who does always says there should be a mash or minigame to escape. these people don't understand the point of the game this isn't struggle simulator were you have to press the keys at the right time its supposed to be tense. you don't want to be caught if you could just either mash or minigame your way out of her belly she would become more of an inconvenience than an actual threat. and sure Ghost could make it a hard minigame but then would you really want to break both your fingers and you keyboard just to get out of Bella's belly the point is being eaten by Bella is supposed to be a bad thing you will likely die from. and I have stated previously that there are defenses you can use to keep Bella at bay or escape her belly easier by filling her up.
7. yes Bella taking your key is annoying but that's the point think about it if you just had an apple it just means you have a get out of jail free card in order to make it so you still don't want to be caught she will eat your key to punish you. and you don't lose it forever you just have to wait for her to burp it out her taking your key is a punishment for being caught so JUST DONT GET CAUGHT. and if you find that hard than that's your skill issue I have beaten Bella mutable times without being eaten you just have to be careful and even so her escape RNG isn't as bad as you think its not an entirely grantee death I once got eaten by her 3 times and escaped each one yeah I was lucky as hell but I took steps to increase my chances and besides its supposed to be against you anyway that's why its to tense its a great feeling.
8. I honestly have no idea what you mean by Bella moving towards your last location usually I don't see her for awhile until running into her later which supports that tense feeling of not knowing where she is. she has the exact same pathfinding as the other students just a bit tweaked with features like being able to hear you and chasing you when she sees you other than that she wanders the exact same way as the other students.
so after all that look your treating Bella like she's some impossible force but look around you almost everyone here in the comment section beat her that fact is you supposedly failing over 100 times says more about your skill than it does about the game. just be more careful check if students are nearby to use as meat shields, try to predict her current location from where you saw her last if you see a student going in the same direction as you stick with them when going around corners listen for footsteps just incase these are the strats I use to stay alive and they work. and its not easy making a game and ghost must of worked really hard to get it out fully in only a month then there you whos complain about almost every feature of the game Bella's sight, Bellas speed, RNG this RNG that when in reality your just having a skill issue thw whole solution to your problem is to just get good. I will admit this game is not perfect I sometimes wish there were more ways to keep the Preds at bay and more items you could use to interact with them though I don't want to pressure any of the devs about this its more of a nickpick if anything if what's already there works it works its still a very fun game and in my opinion one of my favorite vore games. its hard the odds are supposed to be stacked against you that's why its all the more satisfying when you finally win. sorry if this came out a little aggressive I just keep seeing these kinds of complaints and wanted to address them I don't mean to insult you and I'm sorry if I have.