Let's see, at this point, Emma has a major shield up in her mind. xD! Betsy's comment about reading her thoughts really pushed her to put up a giant diamond wall around her mind to keep other telepaths out.
Um... Natalia would prefer to keep her Black Widow ops training a secret. So if they ever interact that's one thing that will stay secret. :(
Valeria's mind is open to be read... if Jean can understand it. xD! Val has like... sixteen million different thoughts running through her mind at one time. It might be geek overload for a telepath. And Lorna is soooooo open, her mind is open like a giant window. xD! And Tabitha is begrudgingly open to have her mind read. Though, her thoughts usually don't go past "I'm hungry" or "I'm bored".... but her past is a rather tough one which revolves around abuse, drugs, and what not... so Jean might pick up on that, Tabby tries to shove those memories waaaaaaay down deep.