Ok short story but it's on my mind and it shouldn't:

A month ago a strange girl I never met went into my room (i left my door open while sleeping in a studentcomplex) and I had sex with her that evening and morning.

That morning I was very busy organising a party later that day so I had no time speaking to her but she and a friend of hers (which is the gf of my roommate) where at my place all day. They left later that evening. I did talk to her for an hour or something (not that I ignored her all evening )

Now I texted her if she likes to come over tomorrow and do something. She likes and comes to me (its a 2hour drive). But in the text messages she explicitly mentions that she will be leaving after our date. at first it was like:
"Maybe I will go to my mum whe lives in the neighbourhood but we'll see... "
I answered like: "Thats fine, see you next week!"
But today she sent me this again: "bla bla bla see you tomorrow, but i will be sleeping at my mums if you don't mind."

Now am I thinking maybe this is some sort of test to see if I like her or maybe she feels slutty about having sex without even knowing me.

But I notice I'm starting to get tunnelvision and thats why I ask the experts. What do you think about that sentence? I like her but in fact I just want to go to bed with her again

The solution I've come up with is just to try and stretch the date till there are no more busses driving and she has to sleep at my place. But if this is a clear sign of a girl just wanted to get away from me as soon as possible and hopes me to pay for her dinner then it's a shitty situation.

So maybe there is anyone who can tell me what this means?

I think maybe she wants a relationship, and she thinks that even though she already had sex with you, now she needs to slow down again otherwise you won't commit to her. Maybe you could ask her flat out what she is after? I am not sure though. I once sarged a half Dutch half Italian girl in college, we had awesome sex, then after that she said she didn't want to be a booty call, and hinted she wants a relationship. If a chick has made up her mind about this, and demands a commitment immediately, this does not fit in my reality. How much effort is it worth to you to change her perspective so she is okay with sex, no strings attached? Either way, my advice is to be a lot of fun, have fun and make her feel like it is her choice to have fun with you, if you have sex or not. Some one who is fun even without commitment.
By the way, are you Dutch (the name, Wouter)? You could always go Dutch on the dinner that will also show her you are not a typical guy looking for some generic commitment.
D.