Flowerhorns and most cichlids love blood worms. Like.... love them to the point they will eat them until they barely swim. When did you feed? Chances are she just gorged herself to the point she looks bloated. I had a male salvini do the same thing recently. Had a trio in with a breeding group of mollys. Well he ate a few too many mollies and looked like he had bloat. Kept a close eye on him and in a few days he was smaller. If she doesn't get better within 24-48 hours of eating take the precautionary steps for bloat. But I'd just imagine she's just full of bloodworms