This past saturday I was a groomsman at a friends wedding and I ended up dancing and hanging out with a few girls, some of them I've known and others I met that night, but I had no interest in any of them but one. Let's call her "Sarah" for now. There was lots of close physical contact, attraction, smiles, and laughs especially when we danced for about an hour until the wedding ended at midnight. We held hands a few moments while standing in place or as she would or I would walk ahead of each other across the dance floor. There was an instant comfortability and kept escalating as the night went on. We got really up close and personal. Sorry to sound cheesy but it felt as if I've known her for a long time. Earlier in the evening before we met, our eyes occasionally would meet from across the room. There was definitely a connection between her and I. At the end of the night we were really up close but I didn't go for the kiss because it really wasn't the right setting (with friend and family at our sides). I had to run but I managed to get her number. Sounds like a sealed deal, right?!…I flew out of town the next morning and texted her Monday night "Hey Sarah, just thinking about the wedding.. I had so much fun

I made my flight btw" and didn't get a response.
Yeah, I know that wasn't a very strong text but her not replying may have something to do with Sarah's cousin, let's call her Brenda. Brenda is a close friend of the bride and was one of the bridesmaids. I've met her a couple of times but never actually engaged in a conversation with her. She was coming on to me way strong during the wedding. She kept pulling me out to dance, being really attentive, touchy feely and even complimented my mom right in front of me on how handsome of a son she has. I don't find her attractive at all, fun girl though. At one point Sarah and Brenda and I all danced together, nothing crazy just friendly. I didn't want to come off rude by shunning off Brenda, instead I kept it friendly so I wouldn't run the risk of blowing it with Sarah. I did notice Brenda made a slight awkward face when she seen me get Sarah's number.
So the very next morning after the night I text Sarah, I receive a text from Brenda displaying interest in an attempt to open up a conversation by saying it was nice seeing me, thanks for the dance blah blah blah smiley face smiley face etc..The only reason Brenda has my number is because she was coordinating a few things in the wedding otherwise we never have text...We all know girls talk especially when they're friends/family. Brenda is the alpha, and Sarah is younger more the quite type, in her early mid twenties and doesn't seem like the person that would want to step on her cousins toes if she senses she's coming in between a guy her cousin likes.
How do I bypass Brenda to get to her hot cousin Sarah? How do I finesse the situation to get Sarah to be responsive? Should I try texting Sarah again or calling, even though i've yet to get a reply? What should I say? I may also be wrong about the connection with Sarah or about her cousin standing in between, but my instinct says no and I don't want to wait too long to make a move.
(fyi, hope this post doesn't sound like I'm full of myself, I'm pretty introverted actually, not the greatest dancer and not the best looking dude in a room but it was one of those night where I attract lots of attention)