Well coming off as too weak isn't going to solve this. A phone call is perfect. If you need an excuse for yourself, think of it as though you are just calling to make plans for next weekend.
Call on wednesday. Mention the party and how you got her myspace but not her name. When she tells you, repeat her name back to her in full. And then also ask if she knows of anything going on next weekend. She probably won't, so mention that you will call her if you hear of anything on your end. Say goodbye, hang up.
Keep a casual tone and you won't be coming off as strong. Make yourself a drink if you need to calm your nerves.
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