What type of dog would my current dog be compatible with?

i am wanting another dog to play with my Cock-a-poo. Her name is Evie and she is sweet, mildly entergetic, not jumpy or anything, she just runs around, or licks a lot, but overall pretty calm. We have a chihuahua that she dosen't get along with(he's old and grumpy and only likes mom, so i cant blame her) and another chihuahua that is really energetic and jumps, and runs around fretting Evie, and she hates him. She gets along with our two female(mutts) dogs though. They are big and kinda protective and serious but there ouside dogs so you could say they are pretty athletic (i guess?) what type of dog would best suite her pesonality