It's tough for me, too sometimes. I've used cheats just to test the game and even then it can be tough. Sometimes I'll just code it for a blackjack every time so that I can be sure the ending works properly or whatever.
Not good that she's disappearing. I think that might be an issue with the Unity canvas, sometimes that happens for seemingly no reason, like two objects conflict somehow. I guess it is what it is, huh?
The next game in the works is much more experimental. Kind of a mish-mash of elements from other games. The idea is fully there, but even we can't play it until it's been coded. Wish us luck!