Well if she's czech I doubt that
But I'm not entirely sure if it is. At least the guys I'm talking with use wanna, gonna and gotta all the time.
Besides that Germans use English more every day. Because it sounds "fancier" than some German words. Even jobs are announced by their english title. It's riddiculous.
And I think about 95% of all Germans under 50 use wanna, gonna and gotta.
She also speaks German and Austrian German...
I just never read those contractions used, except when I'm speaking with her or other Czech friends...
In Prague it is fashionable to speak in English...