Should my son be hanging around his "girlfriend" when they have an open DV case

My son is 23 and has been dating a girl for 9 months. She has a 3 year old child. She was drinking a lot. Got really drunk and started hitting him. She broke his nose and when I picked him up from the hospital his eye was so swollen he couldn't see. Someone else called the police and she ended up accidentally hurting her 3 year old in her wage. She was charged with DV in front of her child. Her and my son broke up for a while but recently started seeing each other again. Since this took place in front of her kid and her kid got hurt he can't drop the charges but I'm pretty sure you're not supposed to see each other when there is an open DV case.