asking the girl about flaking? i can't bag on that cause i havent tried it. At the same time, it seems like if you're getting flakes then there is some element you are doing wrong.
i've recently stumbled upon some info with sound advice i hadn't heard in a while. mention the dinner party or whatever you will be inviting her to, bring it up with your wing, or somehow in conversation "i'm really excited for this dinner party we're having next tuesday, i havent done that in forever"
do not invite her, not yet. later on in the convo, mention, "you know, you could be fun at that dinner party, you would definatley be the wild card"
her: "what does that mean?"
you: (think of something creative, or...) "someone new and interesting for the group to meet"
phone number close
THEN
stay in convo for a few more minutes, it is bad game tactics if you get the number and jet, it also is awkward, so chat for a few minutes and then tell her that you have to go find your friend or whatever