I don't think there's a good video of it, Robbie! I saw her do it once at Joe's Pub.
To be fair, the show is only typically a cast of 8, 4 of which are usually people of color (one, of course, being offstage). For a musical, that's... actually a good percentage. Granted, the trio aren't really characters, and play into the "three black girls singing" stereotype.
If you want really disagreeable, try sitting through a community theatre production with 3 white girls looking like the Pink Ladies as Crystal, Ronnette, and Chiffon.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."