Obviously it is up to you to return her but it makes me incredibly sad. As a mother of a kid and a Frenchie. No dog will be perfect. Your next pup may have a longer tail or a fatter nose. She has been yours for six months? And you could give her back so easily? My Bella has some serious vertebrae issues and even if I had known that the day after I got her, she wouldn't be going back.
I suppose if you plan to show her, but it doesn't sound like that's your plan, just that it bothers you. I would be more of a smartie and say, I am sure there are things about you that irk her, but she still probably gives you her undying loyalty and love.
Obviously, it is your choice, but as a Mom to a not perfect Frenchie I would say to you I don't think you deserve another one. One day that puppy, maybe even two years down the road could break its leg and not be perfect anymore, would you surrender her then?
I am sure you will take offense to me, which honestly is just fine because I think you should be ashamed of giving back a loyal Frenchie all for her eyes not being perfect. Feel free to blast me back because honestly anything or excuse you give will never change my mind on you.
~ Loving life with our Frenchie