Hawkgirl appeared on a couple of covers for a series titled “Darkstars”. This series ran from 1992 until 1996 for a total of 39 issues. According to the DC Database (http://dc.wikia.com/wiki/Darkstars): “The Darkstars were created and run by the Controllers, an offshoot of the Guardians of the Universe. Though their goal was to establish order in the universe, the ancient Maltusian race known as the Controllers were isolationists by nature.”
The Hawks were in a three-issue story arc in issues 5, 6, & 7. They appeared on only the first two covers.
Darkstars #5 (Feburary 1993)
Darkstars #6 (Feburary 1993)