Yeah, I don’t buy this.
Typhoid Mary manages to break into the Jean Grey school, steal something, then only gets found on the way out and is so far ahead that if Betsy wasn’t a telepath she would have made it? No, no effing way. There are too many people not to have some roaming the halls or errant powers to account for, the danger room is part of everything so the instant she was found she could have been gobbled up, and not to mention the lawn is alive.
This goes way past my ability to suspend disbelief.
The rest of this is typical villain escapades… and we pick up two new female villains so that they can start a sisterhood. I can’t be the only person annoyed that an all female team is only fighting female villains, some of which are being brought up from the dusty corners of semi-obscurity… seems like it’s defeating the purpose in there.
As for the whole thing between Roxy and Mercury… I have only one thing to say that:
X-Men: The (fan fic) Series 
Yes, I have to admit, I found it rather unbelievable that Typhoid Mary could sneak into and out of the school like that.
I know right?