your daughter may have totally spaced the comment. in one ear, out the other. or, she might be hurt.
I think your response depends on how your daughter feels and what she wants. At 10 years old, your daughter can communicate these things.
the thing is, if you blast the busybody a new one, then your daughters may not be invited back. it will create awkwardness. which doesn't mean you shouldn't say something. But first talk to your daughter.
This will show your child that you have her back (which is important) and will allow you to foster a healthy body image. It will also allow her a voice in what happens next.