I'm playing Dark Elves on VH as the son and after getting over the initial starting hurtle I started steamrolling, but for whatever reason, decided to befriend some rat people to my south between me and my mom. The corruption from them was getting to be unsolvable without war so I went through the trouble of waiting the 20 turns to honorably end their existence. As soon as I lawfully declared war on them, my fricken mom who I had a 200+ military alliance with decided to go with the rats over me . . . it's not the biggest deal as DE seem to be kind of OP and can basically steamroll advanced armies with cheap darkshard spams, but I kinda wanted to try out my mom's generaling capabilities without having to start a new game as her.

1.) Now that I've killed the skaven in question and I'm at -200 rep with my mom, is there a strategy to get back on my mom's good side again? . . . especially since mother's day just passed and I didn't get her anything?
2.) If i do have to kill my mom, does that mean I can't recruit her?
3.) Why the hell would my mom choose rat people over me?