How to revoke someone's access to my twitter?

I used my friend's iphone to log onto my twitter one day and she never logged off. It wouldn't be a problem if she didn't unfollow people and delete tweets. I know that you can't revoke iphone access from online but she won't delete my account so I have no idea what to do.

Added (1). Oh and I've tried changing my password but that didn't do anything

Added (2). if you didn't read what i JUST SAID, changing your password doesn't do anything it stays logged on to every device

Try taking your friends phone again and logout! If tht is also nt possible then keep tweetng to yurself (@…). Your friend will get irritated and log out!

Change your password and log out then login again.

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