Checkered garter only eats when my Tecas Patch Nosed snake is with her

I dont know if i should be worried or not. I know you arent supposed to house different species but she is very aggressive when she is alone. Ive tried changing enclosures even lowering temp from 85° to between 75°-80°, but she is only content when i put the patchnose in there. He has no problem with it. They eat fine. Share the same basking spot and hiding hole. I really noticed her aggressive behavior after i separated her from my great plains rat snake after the garter had her babies. Im assuming she just might be a social snake but ive never had a snake that behaved like this. They get along just fine. But since they are different species i worry a bit. But she was one of my first snakes so i try to keep her happy but i wanna keep her safe too.