Covid exposure

F

Hi all, my family of 4 all had Covid last week (or so I thought). Day 7, so two days after quarantine ends, everyone is feeling 100% and we are slowly entering back into the world masked, my 2 year old spikes a 103+ fever. I’m trying to be safe- I’ll test her today but is it possible for her to get it 7/8 days after her first exposure? I know they say 3-5 is the coming time frame. Thanks!