I would say hybrid before pure festae for a few reasons. Young female festae have a full row of distinct markings along the lateral line, even when their stripes aren't showing. This fish is missing the second and last 2 markings, and the middle ones are blended together - just like some fh are.
All festae I've raised had red fins by that size while the OP's are still the same color as the body. The marking on the dorsal fin is also smaller and starts further back than any festae I've seen, but just like almost every female fh. The blue around the cheek and lateral line just doesn't look right for a festae either. And it would be pretty unlikely for a festae to be accidentally mixed into a shipment, or for someone to trade one in without knowing what it was. On the other hand, most people will call any hybrid a fh even if it's really not.
I'm guessing this fish is festae mixed with a zz fh.