You will need a much larger cage to house two females together, bigger than the standard adult minimum size (2'x4' of floor space). I wouldn't house two dragons in a cage less than 2'x5' of floor space.
This time of the year would be good to start introductions between two 'stranger' dragons...neutral territory is good as well. You also want to make sure both females are the same general size and weight...to lessen chances of one dominating the other. You also want the new comer to have gone under at least one month of quarantine and at least one health check by a herp vet (and fecal done). This is of course assuming you bought the female as an adult, instead as a baby then growing it up. Though even if not housing them together for several months, best to keep a new animal in a separate room to avoid contamination should it have some communicable disease.
Even if females seem to be getting along ok in the same tank...they can still turn on each other unexpectedly later on. It really depends on the individual animals whether they can live with eachother for a long period of time.
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PHLdyPayne
Forum Princess