Woo boy,
I think all the points were made, but I just want to hammer a few home.
Most women will choose a night alone over going on a date with someone they are not interested in. Why waste the time, and engage socially with someone who might think it is going somewhere when it isn't? Also socializing with someone they aren't interested in or don't like is exhausting. It's quite possible she doesn't want your company at all, and doesn't enjoy being in it.