A question that my readers ask me all the time is, “If a woman brings other friends when we hang out, is it a date?”
The answer is a simple NO!
It is ONLY a date if there are just the TWO of you. If there are other people involved, it's a gathering, not a date.
With that said, all hope is not lost. The girl may still be interested in you. If she spends a lot of time flirting and talking with you ALONE during the gathering, there's a chance that she's still into you.
In that case, flirt back and invite her to hang out - with just the two of you.
However, if she doesn't actively flirt with you alone, then you'll need to try flirting with her and see if she “gets the idea”.
If she starts paying you more attention than her other friends, that's a very good sign.
Otherwise, start talking to and flirting with her girl friends!