It'd be great if you had an obsessive compulsion to get "you're" correct.
As for this woman at your work, does anyone interrupt her on purpose, knowing she has to start again?
Think I'm the first person to even notice it - at first I thought she was just slow. For the most part pretty decent group of people where I work wouldn't mess around with someone in that way.
My mind doesn't process your/you're (bad education) so I don't even realise I'm doing it to correct it.