Current recommendation is 5 days, but if she has rapid tests, it wouldn't hurt to do another. Symptoms can linger for a long time. My cough didn't totally disappear for about 4 months when I had covid (a very mild case, but just lingering cough). Back in the old days (May 2021) I had a contact tracer and was told as long as I was improving after 10 days and didn't have a fever, I was free to leave isolation.
As for your booster, I would probably wait a week or two, to see if you get covid. A case of covid basically will do the same thing as a shot, so there's no point in getting them both at the same time.
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