It sure looks like seed development, probably got exposed to pollen or enough stress to trigger it. From the pictures I don’t see a hermie, but..
Do you notice any little bundles of “bananas†amongst the buds? A hermie is one who self pollinates and can pose a pollination issue to the other plants in your tent. If you do not notice any pollen sacks (on a hermie, they look like bundles of tiny bananas) then you shouldn’t worry about it pollinating and can avoid quarantining it.
however, it is good to narrow down what could have caused seed development like this on your female, were you or your plants exposed to a male plant? If not, were they exposed to any light leaks or unnecessary stress that may have caused it?