but she was once a teenager she had to have dated in the past they should have brought her up to speed on interesting things in this time that young people do
That wouldn't really matter. If you for example, were to suddenly turn into a teenager, you'd have a hard time acting your visual (and physical) age, because of your mental one.
I think she was around her 40s to 50s, (Born 1969 if I remember right) so she probably doesn't remember how she acted when she was young, and even if she'd remembered, she'd act like a 80s kid, in the 2000s