Quoting BoOm French Toast:" If she was having poops before the appointment and a temp I would bet a virus. The shot probably made ... [snip!] ... probably made her immune system even worse. Not sure why they gave it to her when she was showing signs of already being sick."
It's probably my fault. I didn't mention the runny poop because like I said she has poop like that sometimes and isn't sick. She also didn't feel warm at home so I wasn't aware she had a fever. I didn't put two and two together until later.