talk about your status, without asking her.

Maybe you are feeling 'strange' and thinking that everyone is behaving 'strange'. It happens.
Tell her how much you need and like her friendship. Also tell her to feel free to tell you that this is not the right moment to chat or whatever.
You need to reach out to other people and create a web of support.
Don't give up on her, before knowing for sure that she is withdrawing, for whatever reasons.

don't be surprised about your father's behavior. If he wanted to fight with your mother, he could have had plenty of reasons, before you. Quite evidently he doesn't want to fight her.

And remember that every time your mother does not call, or comment shows the extend of her problems. Not yours.
It her. Not you.

Keep up the good word and your new baby seems a perfect work