Your girl is hitting her "difficult teenager" stage. I would recommend obedience training for both of them, to help them know you are boss, not them. I'd start with her, as she's at "that age" and is obviously challenging for the "top dog" spot, and needs to realize you are the head of the pack, not her. You may need to keep her leashed and with you, I am glad you are feeding them separately, but the sooner the better for some training for her!