Really struggling with the girl I am subletting my room to, especially with rent?

I am currently studying abroad for this semester. I have organised a room in a house with friends to move back into in January but until then a girl has been living in it.

When we found her to give the room to we were desperate, she had little money due to student finance messing up and a job that only offered a few hours a week so we agreed that she could have the room for £70 a week instead of £95. My dad is fronting the bill as our landlord wants to be paid per term, not weekly and I am subsidising the remainder of her rent.

She has not managed to pay every week of a single month. She's been living there since September. She sends long rants to me about problems and seems naive and inconsiderate of others. I have done my best to help her where I can and been patient but even the landlord had to tell her to leave me out of problems. I know I have a responsibility to the room but there is little I can do from another country.

She is a lot to handle.

I refused to ask her to move out during her January exams and only insisted that I be in the room before my lectures start. This is going to mean I have 10 days of sleeping on a friends floor because my sport starts practicing before lectures begin.

I am really worried that she is not going to get the money that she owes my dad, to me to pass. The whole thing is really stressing me out, she acts very ungrateful and I don't know what if anything I can do to better the situation?

Advice please, thank you