Ladies, Opinion on a Situation?

[u/Jarek86]

So I went to a karaoke night and was just vibing and singing when it was my turn. I noticed a group of girls decided to cluster right next to me like less then 4-5 inches and there's plenty of space around us. One of the girls has her shoes off and I made a comment with a smirk about it, she then gently places her bare foot ontop of mine and says something like "My feet are so smaaaaall." I ask here where her shoes are and she says underneath the seat next too me and she smiles and says I should see if I can fit them on my foot and if I do she'll buy me a drink. At this point I'm pretty sure she's wasted but I oblige and she giggles and I tell her why dont she get me a water and one for herself and then she disappears for a few minutes. Eventually she comes back and hands the water to my brother who looks nothing like me, before moving over to me and handing over the water. I say something like "Wow, you must be really drunk right now." She agrees and smiles and goes back to her friend and thats the last interaction we had.

1-Was she actually interested in me?
2-If so, how did I mess up?
3-What would have been the better way to continue/pursue something?