Injured female

[MelissaK]

Hi! I'm a new betta owner. I have had Iris, my older one for about 3 weeks. I then bought another female, Rose. Iris was the alpha female. Until today. They were ok for about a week. I came home to find Iris beat up. Her fins were bit off. And so was her mouth. I have since seperated them. They were in a 5 gallon tank. So, I'm concerned for Iris ' s injuries. What should I do?