Unfortunately, people like to meddle. I know your pup came from your friend's dog's litter, but that doesn't give her the right to anything. If you don't want to breed, just tell her that. You can say, "I've researched it, and discussed it with my vet. I don't feel breeding Eva is something I have to, or want to do. She's my little princess and I want to keep her that way." If she insists, "I have already made my decision, please respect it," and just leave it at that.
If Eva is that cutie in the picture, get ready for more requests!
Kaji isn't standard, but I've gotten requests from friends, and random strangers we meet on the street. All I say is, "sorry, he's already neutered." No one can argue with that!
Wasn't there a picture in your avatar?