Wow. She sounds like a little pregnant Diva.

Going by what you say.

She's clearly too immature to be willing to understand finances.
She's whining about partying when she should be concerned about your relationship.
She really doesn't want to be a mom.

You are the responsible one. Sounds like you can choose to take care of only one child or learn to take care of two.

If it's the latter, then no, your relationship won't magically improve over time because you have a baby. Babies tend to really test relationship.....

Good luck.