14yr old DD1 wears foundation concealer, mascara, and sometimes eyeshadow and eyeliner. I took her to Ulta to have them assist with picking out a good foundation and concealer for her skin type and coverage needs and to be able to trying on shades to find good match. For mascara we just buy a drug store variety.
12yr old DD2 I allow to wear a basic mascara and concealer. I do not allow her lip color, eyeshadow, etc. yet.
I think Sephora/Ulta or a make up counter brand would help your DD with getting the right color matching, show her how to apply, and identify the types of products you are ok with her wearing. No reason it needs to be all or nothing. If you want to start out slow with a few basic products, I think that's the way to go. I'd also suggest you give clear instruction about where she can apply make up (bathroom only, in her bedroom, etc) as you may have reason to not end up with lip color or liquid eyeliner on your bedroom carpet. The other thing would be to educate her about how often to replace make up products and not sharing with others to avoid skin/eye infections.
Mom to two amazing DDs ('07 & '09) and a fur baby.
Gluten free since Nov '11 after non-celiac gluten sensitive diagnosis. Have had great improvement or total elimination of: migraines, bloating/distention, heartburn, cystic acne, canker sores, bleeding gums, eczema on elbows, dry skin and scalp, muscle cramps, PMS, hair loss, heart palpitations, fatigue. I'm amazed.