This website might help you choose http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html#b I think that Brahmas are the best they are very friendly and quite good layers... but they are huge!! . the website ^^ does include some information about Brahmas and so does this one...
She might have eaten something that has made her ill, I heard activated charcoal helps but I'm not sure what activated means. this website might help http://gardentenders.com/members/Xploreorganics/blog/40
hope she gets better. x