What bcr229 said, with emphasis on proper quarantine (ask if you do not know how to do that) and no cross contamination with other reptiles.
Also, if she is not sick, which is hopefully the case, and again, said, make sure all temps and humidity are spot on.
Snake can regurgitate if hot spot is too cold OR too hot because they will avoid it.
Good luck and as mentioned, if you are not sure about anything, just ask.