Would a girl spend time alone with someone she is not interested in?

Anonymous
I'm sort of friends with this girl (who has a BF). One day while having our once in a blue moon chat, I mentioned that I was going to go somewhere for the entire day to check out some stuff. Even without me saying anything, she smiled and said "i don't think I'll be busy that day, I could possibly come along...". So we ended spending the entire day together just talking, laughing, and yes flirting. So I'm wondering what the deal is here...I know she is attracted to me...is she just trying to be friendly or something else?
Would a girl spend time alone with someone she is not interested in?
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