Why did she ask me to zip her up?

A girl asked me to help her with her dress, since the zipper was in the back, and didn't want to have to try and do it herself. Which of course I gladly obliged and did, but, I'm curious as to why she did, other than the literal fact that she needed it done.

She could have had anybody else do it, especially because technically, it wouldn't have mattered WHERE she did it, in the area we were in, because it wouldn't have mattered. Difficult to explain but, that's the point, is, she COULD have asked anyone else to, including some of her own friends, so, why did she ask me to

Updates
1 y
I already said, other than the fact that it needed to be done. Do people not read?
Why did she ask me to zip her up?
Post Opinion