Welcome to YT!! How wonderful of you to give Zoey a forever home. How long has she been with you?
I adopted my 2 from someone else when they were almost 1 1/2 yrs old - I've had them almost 5 yrs now. My male Siamese didn't mind them at all until he passed a year ago. But my female still has her moments - sometimes for no reason she will bat at the dogs -- she's jealous. But other times she will cuddle up near them, if they are with me - for the warmth
My Roxy does growl sometimes when she is afraid somebody will get something that is hers or she wants to be hers. This actually a newer trait - I attribute it to aging. But she doesn't growl about her food - more often if I have a snack while sitting on the couch & she is near me, she growls at everybody else - like I'm going to share with her (fat chance) I do correct her & tell her no.
It sounds like Zoey is still transitioning.