You could always try enabling it for females using SimPE or the Wardrobe Wrangler. If it doesn't work, it doesn't work and no harm done. If it works, you get yourself a crown for female sims
Because it sits on top of the head and not around the whole head, it might actually work OK. Male heads are bigger overall than female ones, but something that sits on top of the head could actually work OK for both sexes.