How much does she like me?

this girl and i have been talking for like a year. she said yes to prom last year, but couldnt go bcuz my friends limo ride was $300. well we've been talking since then. yesterday sum random girl came up to me and said that she doesnt even like me... i asked her if it was true and she said no and she got really pissed and wanted to fight her. then she asked if i told anyone that we were bf/gf, i said "no lol, but if sum1 asks me i either say not like that or idk." then she told me, "if sum1 asks me i say idk. he's a really sweet guy, but i have to get to know him better." we went to a sports banquet this last saturday, and she brought her mom over to meet me. well she asked me to put pics up of us, and we always text till we fall asleep. she always asks to hangout. and we're going on a double date next weekendand if i dont see her for a long time she'll ask me if i miss her and stuff. how interested is she?????? btw she's 20 im 17