She can get child support before she files for a divorce. She needs to contact the Child Support Agency for her county. She should also contact county Social Services and ask about Legal Aide.
If he is bringing that child home and driving drunk and high she needs to do something. Take down his license number and call the police after he leaves and ask them to pull him over. Explain to them he just dropped off my child and seems drunk or high. If she doesn't do this and he is caught under the influence with the child in the car, she could get into trouble with CPS. They may think she is using bad judgment allowing her child to be with him. If he is found to be a substance abuser she may be able to get 100% custody with only supervisied visitation. All states are different but here in Wisconsin child support is taken directly out of their check whether it's a paycheck or an unemployment check.
Also she does not need to supply him with items for the baby. If he wants to be a parent then he needs to man up and go buy a crib and bedding, clothes, shoes, diapers, wipes, baby food, bottles and formula; and what ever else the baby will need. My daughter drops her son off with his dad with only the clothes on his back. If he wants him he buys what the child needs.