Not hugely interesting, I'm afraid.
As I said, she had a big problem with blocking scenes (the bit about the tree and the coconut is almost verbatim from a scene she did.), but she was a very chipper person, always willing to chip in, volunteer to try new scenes, etc.
Eventually, one day, we're in rehearsal. If you haven't done improv rehearsal, you basically just play improv games. That's it. Because knowing the game and being confident with it is basically all you need. We were doing an open scene: meaning there was no gimmick, no necessary component, the two guys on stage just had to make a scene together, give it an arc, and make it funny.
They end up doing a Ghost Hunters scene: you know, two dudes, investigating a creepy house. They kind of crossed it with Ghostbusters, in that they had ghost capturing equipment.
Now, as an improviser, hearing that they HAVE ghost capturing equipment means they should use it. Whether it fails, works, or turns out to be fake, it has to be used.
Which led this girl to start playing a ghost.
Sitting off-stage with the rest of us, she starts off with stereotypical "WooOOOooooOOOoo! Who oooo is iinnnnn myyyy hoooussee?"
And that's fine. Not, strictly speaking, needed for the scene, but nothing out of the park.
THEN, she starts demanding things of them "Yooouuuu muuusssttt bbuuurrrnnnn myyy dddiiiiaarrryyyy!" etc. Again, workable, except she then refuses to tell them where the diary is. STALLING THE SCENE.
So, they do the rational thing: They blast her with the equipment. To which she responds "HA! Missed me!" WHich, since she's not actually IN the scene, she can conceivably do FOREVER, stalling the scene again.
We called the scene like, 20 seconds later, but there was a moment where every person in the room WITH the training looked at each other, with a "Are you fucking kidding me?" look in their eyes.
She stopped coming like, 3 months later.