Oh.. thanks for that. I checked on them first thing this morning, and I have already noticed that this one is having trouble eating. it was the only one at the food today, and was at it for over 20 minutes yesterday.
It also doesn't seem to have great balance. It's not always obvious, but if I watch her, I can see her lose balance sometimes.
I have a couple of videos I will try to upload somehow to link to here.