Yeah cause we all know girls never have anything interesting to talk about. I mean it's all shopping and shoes guy, amirite?!? If you're not hanging out with a girl that talks about things that are interesting to you, you're hanging out with the wrong girls. I NEVER had that problem (though when i'm nervous i do tend to talk more than listen which is something i had to do something about, it's not that i'm not interested, it's just that i guess i feel if i fill any silence with the sound of my own voice then there is no awkward silence, just me making an obnoxious fool of myself don't do that).
DO ask about her but not because it's something you HAVE to do but because you actually really want to know. People can generally know when someone is not being genuine. Or i know i can anyway (which tends to be horrible for social life since 80% of people are fakers). If you actually have to force yourself to ask about her and it's not because you're just fighting your own shyness that you're not, then maybe you're interested in her for the wrong reasons (meaning not interested in her as a person but more as a body, meaning you just want to get in her pants...which is fine if that's all you want i guess but that should be clear to both you and her)
Also as we all no the waiting period rules before calling is a load of BS. Do what feels right. If a girl isn't into games playing (which you dONT want anything to do with) and she is actually interested in you, she DOES want to hear from you pretty much anytime.