That or she may have a bit of 'guy' in her, meaning that she was simply keeping her options open in case something better comes along.
Sure, it sucks for me to be so blunt about it, but clinging to something that happend so briefly isn't the best way to be confident in yourself
If she liked you, she will call. Simple as that. Give her a call in another couple days inviting her to something else as if you are going to do it anyway, with or without her, and you would like her company. If she doesn't bite, move along.