L.S.
I would say you can start now but always make sure you wipe her as well, when going #2 she wont be able to do it herself until she is older but just make sure you get her clean after she goes and wipes herself, #1 isnt a big deal but #2 is you dont want to leave her dirty. So just help her until she's older! Good luck, Im working on it with my son who is 2.5 years old and he is finally ready!