Sentence for assaulting a police officer

My 19 year old daughter was very drunk and aggressive and possibly had been smoking cannabis. I ended up calling the police to our home to help deal with her. She was verbally rude to them and when she refused to talk to them they tried to take her ipad from her and she punched one of them in the side of the face. They were sitting side by side on her bed at the time. She was arrested (fairly aggressively and she is covered in bruises on her arms and legs) and charged with assault. At the police station she pleaded guilty and refused a solicitor. She now has to go to court and says she isn't going to have a solicitor. I am worried as she doesn't work or claim benefits so has no income at all. Can she still apply for legal aid and what will happen with regard to sentencing? Will she end up with a custodial sentence if she can't pay the fine (I would pay it if necessary). This is her first time of being in trouble.