"Mascara: Get yourself a pre-wash stain fighter like Shout and apply to the stain using the brush that comes with the pre-wash. Let it sit for about 10-15 minutes, then rinse with hot water. Launder the garment immediately either by hand or in the machine (whichever is most convenient for you). Let the garment dry flat instead of putting it in the dryer, especially if the stain isn’t completely out. The heat of the dryer can set the stain further rather than working to remove it."
Ignore the fact that I'm a guy answering this, I've just had incidents like this among sister's and girlfriends. Get anti grease soap and rub a little bit of that in the stain along with a like a drop of water. Then let is sit for a while, maybe about a half hour.