Doesn't sound like she actually has realized she is "former."
You may have to spell it out, as the two PP's suggested, but be prepared for a defensive response and "everybody's mean to me."
This kind of happened in my social circle a few years back. Jill was annoying everyone, and one guy in particular, Fred, was getting tired of receiving the stream of negativity from her, especially via IM while he was at work. ("My life is horrible, so-and-so is causing me so much stress, the world is mean to me.."). So when Fred had a big BBQ, he decided not to invite her. Mutual friend Bill didn't realize she wasn't going (it was a big party, most people invited) and quite innocently asked her how she was getting to the party. That was when she found out there was a party she wasn't invited to. Fred later said to me, "I had thought about inviting her, but she's been so negative lately and I just didn't want that at my BBQ."
But once Jill found out, she actually emailed Fred the day before the party and asked him why he hadn't invited her. Now Fred doesn't take to drama gladly, and the "why wasn't I invited" email was enough for him to "defriend" her altogether (on FB, in real life, block IM's, etc).
Now she will whine to anyone who is willing to listen that Fred dropped her "for no apparent reason." (This is a pattern for her). When someone tried to explain it to her in plain terms, they were met with hostility. It's too bad some people want to stick their heads in the sand instead of learning from people who are willing to be straight with them. This is the same person who got annoyed with me for being busy, btw, if you saw that thread.
Poor Linda is probably one of those people who just won't get it, either.