Maybe go on a date with her to see if you like her. From what it looks like she came to you too easy, like trowed herself at you so thats why you are not interested in her because shes not a challenge. But girl could be good for increasing your dating experience and experience with girls. I mean you are lonely as you want to be, might as well interact with girls and get something out of it.
Then again with girls you actually like you might not have a chance because you would lack confidence and be shy - side effects of lacking experience. You need any kind of experience to make it right down the road with girls that will actually matter to you.
In your place I wont turn girl down but give her chance to see where things goes. And in the end you dont like her you could just hit it and quit it.
https://www.facebook.com/viralthread/videos/582587785247242/?pnref=story
Doubt kills more dreams than failure ever will