Maybe your mom wants space. She might be too focused on arguing with your dad to see what she's leaving behind. I think you could give her time and let her get in contact with you.
And I know it's not the same but my sister and I got on terribly when she lived here, and when she left I presumed I wouldn't see her that much anymore, and wasn't too bothered, but we started meeting up a few times on her break and became great friends.
So although it's a big change in your life and lots of things seem up in the air, there might be something really good to come from this.
Also I'm sure the atmosphere must be thousands of times better at home. And I don't know but I'm sure she loves you, but maybe her mind is clouded at the moment.
