Well, I'm certainly not an expert (I've only had my piggies for a couple months now). But I might wonder if she was a bit dehydrated. Especially when you mentioned the difference/size of her poo. Has that gone back to normal as well?
My Harmony will spend similar periods at her water bottle. Boy they sure are loud drinkers, aren't they? It's like she doesn't drink until she's done. She'll drink a little.....them come back.....then come back again. This is pretty normal for her though. Especially at about 4am in the morning.
