You in the middle of something? I'd probably just give half the spokes half a turn and figure out the problem afterwards if so. Maybe check the hub first in case something has come loose and the locknuts ain't tight.
It's the grrl's bike with another bike's wheels fitted. I'll give it a quick look but working on bikes these days is literally flipping a switch in my brain that turns me ragey for some reason so I think it's better I forget about it and she takes it to the bike shop.
You in the middle of something? I'd probably just give half the spokes half a turn and figure out the problem afterwards if so. Maybe check the hub first in case something has come loose and the locknuts ain't tight.