I asked a girl out to lunch and she made it a group thing even though I thought I made it clear I wanted it to just be us?

So I met this girl a few days ago and we talked a little bit not much and I was liking her and she was pretty and I thought it was mutual. I asked her if she wanted to get lunch together and get to know each other better and she replied with yea that’s cool maybe we can get a group of us together. What does this mean?
I asked a girl out to lunch and she made it a group thing even though I thought I made it clear I wanted it to just be us?
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