Fixation on cat

We adopted a 1.5 year old from the shelter in October. Shes SO fixated on our cat. It’s never aggression (I don’t think). She barks, and does the play pose and bounces around, and chases her but she backs off when the cat smacks at her, but only for like a couple minutes and then she’s harassing her again. She also harasses our senior dog the same way, but she isn’t fixated on staring at our other dog or like watching where she is at all times. (The cat has an escape route to the extra bedroom that neither dog can access)

My wife is just annoyed that her already unsocial cat doesn’t spend much time out here anymore before she retreats.

(In case it’s important, she’s 61% Chihuahua, and the rest is like 25% Australian Cattle Dog and 7% Dachshund)

We try to stop her everytime but she just does not seem to get that shes annoying them. She gets lots of play, enrichment, etc with us.