I found a mod that allowed me to move her relationship up, yea it skips the event that is for level 30, but you can at least follow the rest of her story. I was stuck on her being level 30 even though I completed everyone else's story.
What mod did you use? Does it work on Android?
Its Lains walkthrough mod on F95zone. It says it works on android but idk, I have it on pc.