I agree with you 100%. She always is the first to come back when they go out. I asked days ago when Deb/Miranda were running out every night why they did not include her.
She stayed alone in her room and Karla sensed that and spent time with her. They will come to her for a facial massage and hang out at home but don't want to go out with her. I really wish there was audio of the departing speech she gave to Karla.
You notice Deborah did not give a toast or speech but went to get in the tub and later out with her alone, again leaving Tina behind. Karla did hug and kiss her goodbye though.
For some reason, she gets no respect from the other girls.