Will the local laws allow you to get 2-3 more?
If so, check the classifieds/Craigslist/marketplace for farm swaps or POL pullets.
Do you have other animals she will hang out with? (I know someone who's down to a lone hen who hangs out with the cat and small dog.)
Generally speaking, introducing a lone hen to a flock means she will be picked on or always be a loner on the edges. There are exceptions, but they do tend to be rare.