That is actually a bit unsettling. I can certainly expand upon that. Some options...
She got addicted to the cheap thrills of academy simulations (Which would probably be real life still but with remote controlled and/or dummy viruses)
Untraceable drugs helped her forget, thus not immediately leaving the academy
She actually got a good feeling about being able to help someone in a tangible way (Least likely for me to take her up on)
She constantly imagines that it's her father she's training to beat down, letting out pent up aggression slowly over academy years. (She probably has some violently brushed paintings at the old dorm)
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I'm having a bit of trouble with this one, actually. I believe bitterness to be a paralytic so I'm unsure how to work this out. I'm going to give myself some more time to think it over I think. But I'll leave the options above anyway because I like spitballing, it's healthy for a would-be writer.