Flies around one of my goats

Flies that seem to swarm over a single goat would have me alert as well. Usually when a goat is not well we see more Flies on them. I would do a check up just for peace of mind.
Temp (101.5-103.5 is normal range)
Famacha (lower inner membrane color should be deep pink to red)
Rumen, listen for gurgle, burps and gasses
Is she eating well, pooping berries, peeing and chewing a cud? Eyes bright and alert? Coat is soft and looks good. Is she with her herd mates or off to herself? Acting off in any way?

If everything looks good. Then I would simply boost her immune with daily probiotics and fresh raw garlic and maybe add a bit of fly repellent.

Check her over thoroughly for any open wounds and also her back end. Any pus, diarherra, weepy areas that may attract the flies?

Check her really close for wounds, scabs as suggested.