Immobilizing the broken wing should make her feel less pain, but you can also give her one chewable aspirin two times a day to take care of the rest of the pain. Giving her electroyte water with extra sugar can help balance her chemistry that has been totally upset from the attack. Keep it up for the next three or four days.
With her wing secured to her body, she will find it difficult to get around much. Keeping her in the tub or in a hospital crate is best. But, if I understand correctly that you've just gotten a few new chicks, if you could manage to create a space where she can see and interact with the babies, she would be much more content, and this can assist in her recovery.