It's because her father, deteriorated further. Not only did he give away items from her business, but he also intends to sell some properties belonging to his daughter.
But before that, her father persistently banged at her door 3-4x a night for every day of the week, causing her and her two friends sleeping in that room to feel immense pressure and be unable to fall asleep.
What can you say when three girls are inside a room, and a violent bipolar grown man is banging at their door? It's only natural for them to feel fearful and distressed.
And you do know that resorting to violence against a person with bipolar disorder is not an acceptable or effective approach.