she has to register as a professional makeup artist and then they'll send her a discount card... there's an enrollment fee but i'm not sure how much it is. i'm sure it's written on the website but i'm too lazy to read it!
Best bet is to email individual companies and ask 1) if they have such a thing and 2) how to take advantage of it. I know a few lines off the top of my head, but I don't know the requirements for their programs.
for MAC its:
40% for Makeup artists working in the field (need 2 proofs: Business card and letter)
30% for hair stylists (you need to show your hair styling license)
20% for makeup students (you will need a letter from your school)
For MakeupForEver its 20% for all people working in the industry (I think)
Beauty stores in your area usually give 20% discounts as well.
Nars, Stila, Smashbox and a few other companies offer discounts, but they have stricter criteria (must belong to a union or agency or able to provide a tear sheet) and you can only receive the discount if you order over the phone directly from them.
I believe you can apply for your card from Macrpro online and they send you your membership card, but if you go to the stores and forget it they'll take your beauty liscence. My friend is a pro and I go with her to the macpro store and they have some great stuff they dont offer to "non pro's"