Got a real, real lame question and don't know who else to ask

WARNING: WILL BE TOO LONG FOR MOST OF YOUR ATTENTION SPANS


First the backstory. I went to HS (and college) with a girl but we've never been "friends". More so just casual acquaintances that have a few mutual friends. Last year we sat next ot each other randomly at a football game and it was probably the most interaction we've ever had in our lives. For some reason, she added me on snapchat after that (we were already friensd on facebook, probably simply because we knew each other existed in high school). We never talk/text or ANYTHING, this is the type of relationship where if you saw each other out in public you'd stop and say hello and talk for 2 minutes, but you'd never even think of inviting them to hang out.


Ok so there's that, now to my situation. She was updating her snapchat story this weekend like girls tend to do, and there was one girl that is a friend of hers that I've never seen before that is stunning. Like this girl is absolutely gorgeous, but not TOO hot in a way that she's probably a bitch. Just the right amount of being hot that makes you think she's probably still a nice person. I'm in the seinfeld-like dilemma of really wanting to somehow find out more about this girl, but what methods do I really have?

1) Inviting the girl I know to hang out under some false pretense is off the table because it would be almost painfully awkward to even initiate that. That's not the nature of our relationship, plus even if I did how would I even mention bringing that other girl along?

2) The "get right down to it" approach could be ok, but has a VERY high risk/reward factor, as well as a certain level of creepiness. "Hey, I know we don't talk a ton but that girl you were putting up pics of this weekend is really hot, mind if I got her number" doesn't really seem like much chance of success.


So I realize I'm most likely screwed here and don't have a chance, but is there some other way I'm not thinking of that I can somehow get myself an in with this other girl? I've already resigned myself to never making any progress here but figured I'd at least ask if there was something I might be missing.