Once you've reached her "final size" interact with her tank one last time.
It's got the bad ending option, and one which just exits the menu
Maybe it didn't unlock properly, or is invisible?
I could try again
I see what you mean now. No you got them all. the first ending is simply getting to that final stage and leaving the building, other one is choosing to help her down early, last one is bad ending.
sweeet ty for your help <3
I was hoping to get to join in the fun ;3