So first you redownload the game since they fixed the ending. Then choose all of the same classes she has and talk to her(Healing, potions and combat and defense) (You can find a list of all the students class list if you scroll a bit down the comments!) Then, in your free time, talk to her in the Arena, Infirmary and Library. You'll become training buddies in the Arena, be a drama queen with her in the infirmary, help her with the book she needs in the library (I think you can only find her once in the library for that encounter). Spend lunch with her and help her practise magic. There will be a time where you'll find her old doll, but hide it first and listen to her on how and why its so special, then you return it. Oh and there will also be a time where you listen to her backstory so listen to her and stay with her. Best of luck!