Are you sure it's a female? Is one brightly colored, and one lacking almost all coloration? There does seem to be more females around lately, but they are generally considered pretty a pretty rare find at an lfs
As a general rule, dwarf gouramis should be kept as a single, or in groups with atleast 3 males and a 2:1 female to male ratio. You'll likely find your gouramis will begin to fight. If it's a 55 gal
or larger tank it's possible they might live together peacefully, but in smaller tanks one usually eventually starts picking on the other until death.