how would I approach this situation? hmmm
well for the mostpart I am a brutally honest person haha but I tone it down for friends
So I would be there one day or night before going out with her and just casually mention it WHILE SHE IS PUTTING it on!
"hey hun? What foundation do you use?"
"I use ______ why"
"I LOVE the coverage of it, (or w/e you DO like about the foundation itself not how it looks on her) but that color is a little rusty. Do they have other colors? I mean I'm sure they do but do they all have that same base type color (sorry I dont know much about makeup so Im making this up as I go haha)"
Make it sound like you are interested in getting that foundation yourself, then go out together and try colors out together and get her to try other colors.
THEN when SHE puts on a color that compliments her rant and rave over it and then grab the one she usually uses and SHOW HER the difference! If she likes it then she will change, if she doesnt then well...there isnt any hope LOL. And telling her straight out "your foundation makes you look like you have a fake tan for a darker woman" wouldnt even help at that point haha.
People respond to things better when they think they are the one making the choices rather than people trying to change them or w/e.
lol thats just me tho LOL