@René389 If it has already been two weeks, then it's too late for her to leave a review. Sometimes guests just don't, and you have to accept that. I understand that you're new and need reviews, but it's really best not to ask. Guests get reminders sent by AirBnB, so if they're going to leave a review, they have plenty of opportunity.
I never ever ask for a review- I'm operating on the "be careful what you ask for" principal. I'm sure you'll get some lovely, future guests who will leave you glowing reviews. Cheers, Kia