When a girl texts completely?

She probably noticed that you didn't use text shortcuts and changed her style to match yours. I text different people different ways. Maybe she thought since you don't use shortcuts that you wouldn't understand some of the things she was saying so she fixed it. Maybe she knew how it annoyed you and didn't want to be 'that annoying girl'. Maybe she wanted to impress you with her proper grammar. There could be many reasons, but whatever the reason, you are definately over thinking it... If you would really like to know, just ask her!