Hello,
Yes, so anyone wanting soul orb can just beat one opponent and get the code.
Wendy was always going to replace Luna but it was suppose to happened after you complete Rose's quest. Originally you were suppose to beat her in poker game which will make her appear on Mayscape apartment level. She would task you with getting the letter you find in the asylum safe. After that an NPC would appear on Sunflower streets giving you more info on what she is looking for. After that she would leave a note behind with passcode to the which has soul orb.
The tall lady is one of my favorite characters I have created. As I've said, I have already planned Wendy being Ted's wife in future. You will also appear as cameo in a quest in Magic Ring.
Those who have problem with NTR content and decided to voice their opinion in that way only have made me cut a lot of content such as Rose's quest, Melanie as recruit, Luna's animations after you replace her, Ruth's doll as Wendy's vessel and parody porn website.