Please bring her another dog friend. They feel lonely. I've been through this recently and the only way to heal (yourself and your dog) is bringing a new furbaby.
We have had small lap dogs always and we always had them share a giant bowl of dog food and water bowl. The kind great danes need lol we always have water filled fresh 2 times a day any old water we tossed out for new. And the food was measured for how many we had never more than 3 to a bowl. We trained them to share. Honestly I found that when an animal shares their food bowl they become nicer towards each other.
I'll
Shut up I'M AN ADULT!!