Got home and my only chick remaining got pecked by the bigger chickens
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Keep her separated and warm, gently cleanse the wound and apply some plain neosporin or vetericyn.
Watch for any signs of infection like pus, oozing or odors.
Add some poultry vitamins/electrolytes to her water if you have them.
Offer some wet chick starter with a little hard boiled egg, tuna or mackerel to give her some added nutrition.
I'm not sure how to treat a broken wing, so you may have to search for that.
Read up on integrating a lone chicken into the flock so when she is healed up and ready to go back outside, you have (hopefully) less drama to deal with.