You all ever meet someone (acquaintance, friend or other family member) who sabotages your happiness? Like...they will go out of their way to ruin your plans?

There is a person in my life (family member) who today, I realized that I cannot tell when we are going out of town, on vacation, etc.... EVERY TIME I tell her that we'll be gone during this time, etc... this person will say something like, 'oh really' and will change the subject. Then, it never fails; 1-2 days before we leave for that trip, she'll call up and go on and on about some emergency she's having. It's either her car has mechanical troubles, or she's deathly ill and needs help...something that requires our money, attention or help.

We've had to cancel a trip before because she was supposedly deathly ill...but when I went to visit her, she was miraculously cured. This happens every time without fail. My husband finally told me to stop telling her. Sure enough, the times we went for a simple, 3 day road trip, no calls...nothing. If she doesn't know about it, she doesn't call or have a fake emergency.

The times that I told her we can't help and went on our trip anyway, she would try to guilt trip us and make us feel bad that we're on a trip. And all we do is take fishing trips, which she hates, so it's not like she wants to go...I swear, she just wants to ruin our trip.

What the heck is wrong with someone like this? It can't be jealousy, because she just came back from a week long trip up north to see her friends! Is it just pure meanness? I know for a fact that this person has been diagnosed with BPD so could it be one of those traits?