Finally i've found some Portuguese dude here
Just by curiosity, Is her name Natacha and does she studies medicine in London, New castle? If so be careful, she's some dude using fake pics on Lovoo website...
If not, then forget all of this.
So you should text her this way she'll have time to think on what day she can go out with you.
Also don't freeze her out until that day, text with her to avoid losing comfort and connection, you don't have to text her much tho, but make sure that at least you send her a few messages before go to sleep.
CHAT