I have two females.
I love my girls dearly. But yes we do have some jealousy issues. We even have a fight occasionally. Thought it would stop once one proved dominance but it still happens some. However, with that said, if you really want to make it work then it will. I always thought Rosie was the most laid back Yorkie ever. But I found out when there is another female involved she can turn on the meanness! I do know of others that have no problems what so ever. Mine are 4 years old and 1 year old. I was told getting a puppy is better. Good luck!