It's meant to be a good AB for skin infections.
It may not have anything to do with it, and nothing you can do about it now, maybe mention it to the vet if you end up taking her back in.
I know of members whose kitties have had much stronger reactions to it, the problem with it is when it's in you can't get it back out, you just have to ride it out. I had a similar problem with George, vet gave him a long acting steroid, which knocked him out of remission, I had two weeks of really really ugly numbers, until it started to clear his system it felt like I was injecting water.
I usually wrap all meds in a small amount of cheese spread, rather than pill them, which I can do, I just think it's less stressful for them and for me. Felix at the moment takes his heart tablet in cheese ball rolled in freeze dried sprinkle crumbs, like a schnitzel