I think it'd be okay to try it again, just a little bit, and see what happens. Green poop is a normal response to too many new things at once or general stress, but it's not really too serious other than as a warning sign. She may do fine with a second attempt at chicken, or if she has green poop again, you can wait a couple months before you give it another go & see if it's related more to settling in & getting used to things, or if it's a reaction to the chicken itself.
Side note: Make sure the chicken isn't enhanced with added salt. It should say on the package if there's any added. You want the sodium content to be under 100mg per 4oz serving. Chicken (or any meat) that's high in sodium can sometimes cause itchiness, stomach upset, etc. in animals.