Why would a girl invite her friends to a 2nd date?

So the first date was good. She agreed on the second date. And when I finally asked her if Sunday evening was good, she replied saying:

"Yes, just tell me the place and time? I have a couple of friends who might join us"

I replied:

"Sure, I would like to meet your friends. But I would also like just the two of us to spend some time on our own - they can join us later. Does 8pm at XYZ suit you?"

So I have two questions:

Firstly, why would a girl want to bring friends to something she knows is a date?

Secondly, was my reply to her text okay?

-Cheers
Why would a girl invite her friends to a 2nd date?
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