What is Mary Warren's reaction to Abigail's performance in "The Crucible"?

In Act 3 of “The Crucible”, Mary Warren is brought to the court by John Proctor to tell the judges that the girls, particularly Abigail, have been lying and pretending to be bewitched.  Mary Warren tells the judges that Abigail and the girls’ performances in the court have nothing to do with witchcraft; she tells the judges that it is “pretense” (fake).   Mary Warren tries very hard to convince the judges of this because she fears John Proctor but since she fears Abigail and the girls even more, she eventually gives up on telling the judges that the girls are pretending and joins them once again.