Need some advice!

[LauraPants]

Hello,
I am new here and in need of some immediate advice. I have a 10 month old Pit and have been having some MAJOR aggression issues pop up.

A little about out story. I have 5 yorkies, which I have had for years, Gem is a 10 pound Yorkie and suffers anxiety issues and has killed 3 other Yorkie over the years. She is older and I although I need to I just cant give her away. Poly (the pit)came into our lives at 5 weeks (ya, some guy was selling em that young! CRAZY right!) in May. She grew up with 3 of the Yorkies and my cat. A few months later my Landlord found out about her and she went to live with my mom, Gem and a 10 yr old Yorkie. 3 weeks ago we all moved in together the day after Poly was spayed.

Since then Gem attacked a Yorkie and Poly jumped in and killer her. Now she is showing food aggression and has been lunging at The Yorkies and growling. She got made when the 10yr old went by her bone, growled and went after another for no reason. I am 6 months pregnant and she is really hard to pull off if something goes wrong. She has been with all of these dogs most of her life and has never been mean or aggressive. I free feed and there is always food out.

I have been in tears for a week and don;t know what to do with her and cant bare the thought of re homing her.

please help!