Thanks everyone! I made an appointment for her to see the vet. I was going to get her spayed after the holidays and all her permanent teeth were in, but mother nature drives the decision

If she's not in heat and most of her adult teeth are in I will schedule her spay. My molly didn't go into heat and I had her spayed at just under a year.
Yes she was humping another female my older but smaller yorkie. They both are fighting to be alpha LOL
I keep my pups on a leash and only out to potty. My neighbor potties the girls during the day while I'm at work. She has an intact male chihuahua. I told her under no circumstances is she to let them out together until I get her to the vet to see if she's in heat and have her spayed. She is very responsible about that. I don't understand why she doesn't get him neutered but that's her choice.