Single&Pregnant

My best friend is 36 weeks pregnant, her baby daddy is extremely absent, and I have kind of taken on a supportive role for her. I've been to birthing classes with her, I'm going to be the only other person in the room when she delivers, her registry is getting sent to my house because her family is unsupportive, etc. I kind of feel like it is my job as her best friend to be there for her and she tells me all the time she loves the support. Our other friend is coming to town, who we have also been friends with for 8 years and she has literally done NOTHING. She called her maybe once, didn't know the baby's name, due date, baby's fathers name, hasn't sent her anything for the baby, no texts and only talks to me about her and her pregnancy. She claims she has too much going on with the men in her life. My best friend thinks it's complete BS because our friend is notorious for lying and coming up with ridiculous drama. She doesn't want her to have anything to do with her son. Should I say something to our friend? Should I feel the resentment that I feel? She wanted to surprise my best friend by coming to town but because she's so far along and is filled with a lot of emotion right now and a lot of negative emotion towards our friend I told her she was coming and she was grateful. I feel like our friend doesn't get it.