This game is very promising and I'm happy to see it making good progress.
I would like to report a... bug? Perhaps unintended behavior? You can get a desk between you and Saiko-chan to keep a reasonable distance between the two of you when you're "dating her". As such, if you're low on health, and she tries to offer you health, the AI will swiftly do its "running away checks" before you have the chance to remedy the situation, and immediately move to "I've been rejected" prompting a personality switch.
Maybe make her attempt to run around objects first, and only have her register as being "rejected" if the player physically moves away from her by reading player inputs rather than simply checking the distance.