The family and the friends have stuck out their necks for everyone on the show. I think Teresa did say Kathy is fake to Jacqueline and Carolina. As always Teresa always turns it against the other people and friends.
I think the only reason Teresa called Kathy to talk was to have Kathy on her side and go against the other women that Teresa is pissed off at. Teresa is the fake one on the show. She is always bragging about her life and her books.