I ordered a Kong toy for my dog and my sister doesn't like it. [I Am Sad And Angry]

Ok, listen. I have a small jack russel terrier mix who is kind of chunky but not overweight in my opinion. She's around 13 pounds, is that overweight? My sister thinks so, I think she could lose a few pounds but she acts like she's 100 pounds. I got her a Kong toy because I heard they were good for keeping your dog busy and stimulating. I get it and am SO excited! I make a little mix of peanut butter, yogurt, banana and a few little bacon treats. I put it in the freezer and give it to her, and my sister YELLS At me saying that she was already fat and didn't need MORE treats. I defend myself saying it's like a tablespoon of something tasty to keep her busy, but I get yelled at more. And for some reason my dog finished it pretty fast so I got yelled at since it didn't 'keep her busy' as advertised. I mean DID I MAKE THE TOY? NO! I saw how it was advertised and BOUGHT IT THINKING IT WAS A GOOD IDEA! I am SO mad and crying, she makes it seem like I hate our dog and WANT her to get obese. Of course I don't!