For phone calls you can 1. not answer, 2. answer but always be on the way out the door and can't talk, 3. if you have a cell phone, tell her your battery is about to die (I use this one a lot).
For meetings you can 1. go to another meeting place and/or time, 2. find someone to talk to before she can get to you, 3. If she engages with you, tell her you are sick (and you probably ARE!) and need to leave asap.
You could send her a card, letter, email or text expressing your need for space.
just some ideas. I tend to attract emotional vampires myself. I need to make a garlic necklace or something LOL