Rant/Question:A mother who only wants to party.

What would you ladies do if your 15 year old daughter whom is a mother dropped her responsibilities as a mother and snuck out to parties?

I'm a mother and my 15 year old daughter is my last child. I did not plan on raising more children. I work full time and I've talked to her numerous times about her responsibility as a parent. I told her many times that she's the one that decided to have sex and keep her baby. As of right now, party days are over and it's time for her to step up as a mother. It's not mine or her father's responsibility. My husband and I work full time jobs (He works during the night, I work during the morning). We told her that she needs to just focus on school and her baby, we will pay the bills because I know how tough it is to be a teen mother. When I'm sleeping during the night, I've woken up to see my grandchild in his portable crib in my room while my daughter is gone. I've been woken up by his cries many times. She wants to party with her friends but this baby should be her priority. It's not like we don't let her have some alone time. My husband and I help take care of her baby. We take care of him when she's busy with school. We let her rest when she needs it. Of course this is my grandchild and I'll do anything for him but we are sick and tired of going to work exhausted while worrying about our daughter. My husband even had to leave work a few times to go find out where she was because she wasn't answering her phone. We are tired. Does anyone have any ideas on how to handle this situation because clearly we aren't handling it properly. We are also going to our first therapy sessions next month so hopefully that will help.