We could kid about feeding her more protein in the form of live foods, frozen/ rinsed blood worms or frozen/ rinsed glass worms. If may be that a yet slightly more frequent water changing effort (easy for me to say ...) will lower "stuff" in the water. Aggression can be a product of not quite perfect living conditions.
High temperatures can also promote aggression. Your tank should be comfortably cool as guppy tanks go. Stan Shubel told the story of a raising guppies on a three-tier stand. He specifically set heaters up in each tank to control temperatures.
The tanks on the top stand averaged 84 degrees F. The fish were mature and winning at shows by 4.5 months, over the hill by 7.5 months and mostly dead by 12 months. The middle tanks averaged about 74-76 F, they hit their prime at about 7-8 months, were done showing by about 14 months. The bottom and coolest aquaria averaged 72 F. Those guppies really took their time, were "showable" at about 9 months, being showed up to 18 months, and lived about 2 years!
While the top tank's guppies ate the most and grew the fastest, he noted that the others caught up in size. He also noted, that within a specific batch of guppies, late blooming males were often the largest and most colorful of the bunch. He suggested not being in too much of a hurry to select a breeder for a strain.
He also noted that, for him, the golden-bodied sport seemed to live longer than the grey-bodied guppies. He assumed that there was a fortunate genetic fluke that accompanied the golden body and warranties ran out later for the golds. I remember a pretty durable tank of red-tailed golds I set up for one of our kids. They certainly outlived the youngster's interest. :( Good thing the regular maintenance crew was still there.
Somewhere in the literature of scientific studies on guppies, probably Dr. Anne Houde's Sex, Color, and Mate Choice in Guppies, it mentions females so harassed by over enthusiastic males that they would turn on them. Biting on the fins, side and even biting off the gonopodium could be the result!
I've never witnessed (to my knowledge) that latter behavior, but would rather it not happen in my aquarium. Crowding for most creatures can also lead to friction. Maybe, a breeding net or separate temporary residence for that male would be (as Martha Stewart would say) a Good Thing.
By the way, that book by Dr. Houde, in paperback from Princeton University Press, is still on sale at
http://half.ebay.com/cat/buy/prod.cgi?cpid=391776&domain_id=1856&meta_id=1
All the best!
unc;e
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