How do you remove your twitter log in on somebody else's phone?

[Problems Everywhere!]

I Logged into my twitter on my friends Iphone..and my log in details saved.
we fell out and I asked her to delete my log in on her phone but she wont..
She keeps logging in on it and going through my direct messages and impersonating me.
is there anyway of dealing with this situation?
Asking isn't really an option anymore. and twitters assuming its my phone i logged in with so i can't delete it..please help..i want her to get off my account desperately and she's saying nasty things and it falls back on me.

[Anama]

try this:
log in
change your password
change your email address
log out.
synch on your phone.
She should not be able to log in after that anymore.
I don't have a twitter account, but I think that should work...

ah, here you go..a link that should help:
http://www.andreavahl.com/twitter/what-t...hacked.php