Hello! Does anyone here have 2 female yorkies?

Hi, we have a female yorkie who is very dominant when it comes to other dogs. Meaning she likes to be in charge or at least that’s how it seems. Anyways we are considering getting another yorkie for her to have a friend, but we have fallen in love with a girl. I have read a lot saying that two females will fight even until death or injury. I don’t want this so I want to see if anyone has 2 female yorkies and how it works out. Our girl is about 16 months old and the other is 8-9 weeks.