Well, her Glee co-stars certainly aren't gonna be saying "She's a total bitch," when they're on a talk show... and especially not when they're riding the gravy train.
Unless she gorged herself on humble pie in the last 2-3 years (my stories take place post-Spring Awakening but pre-Glee), I doubt she's changed much.
And for the record, her Spring Awakening co-stars, all in her same age range, are, for the most part, extremely sweet people. John Gallagher, Jr., who has a freakin Tony, is a sweetheart.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."