SHe will definitely eat free in any buffet restaurants you go in, and in some TS restaurants they also offer a free 'toddler' meal (not from the normal kids
menu), but I am not sure which restaurants (seem to recall someone posting Auberge and Cafe Mickey, but I would just ask when you go). She won't get anything free at CS restaurants.
Regards asking for proof, we have never been asked for proof when DS was under 3yrs but it is probably wise to have something just in case, specially if she looks like she might be older.