Deadbeat parent vent

Destiny
So I'm a pansexual woman, and was married to a lesbian for almost a year, we have a 7 month old together and split up when he was 2 months old, and since then she's seen him once, and hasn't help support him at all. She never buys him things he needs like wipes, or tylenol or clothes, I take all the financial responsibility for him and myself, which don't get me wrong I don't mind and I love my son. It's just ridiculous we went into the pregnancy after trying for a child because we both wanted to be parents, looking back it was probably stupid because she was abusive but I don't regret it because my son is my entire world. At 2 months old she abandoned us and left me with the house payment, the car insurance and payment, and all the bills, while my son was in the hospital because he was really sick. She even got me kicked out of the hospital for how she was acting. She literally shoved me into a cabinet while my child was in his crib crying because he was sick and wanted to be held all because I told her if she wanted to be mad at me she had to tell me things before she freaked or cause I didn't know them. Like for example she would get pissy when she volunteered to sleep on the ground on pillows in the hospital and let me have the couch, and then bitch she was cold, when she volunteered to sleep there and never once asked for anything to cover up with. Then would tell at me for making her sleep on the ground when she said she would and insisted it was fine even when I asked multiple times. And now she finally got a job, and she isn't helping at all and my attorney seems to have misplaced the divorce papers (I can't switch, he's a family friend and is doing it for free) so we're still technically married.  Even though since we split (in January, the 28th exactly because my birthday was the 31st) she hasnt seen him except once, and hasn't asked about him or tried to video chat him. Even though he is probably gonna have to have open heart surgery, and is really sick right now. She either needs to terminate her rights or pay child support and act like a damn parent. I'm sick of it and just pissed off. My son deserves better then this bullshit. How's he gonna feel when she's not in his life or he can't play basketball because mommy has to pay bills and his other deadbeat mommy won't help. I need to file for child support through DHS, which is department of human services, but I don't know if they'll let me since we're technically married. She is on his birth certificate also.  I'm just pissed at her for being such a damn child and deadbeat.