Thanks so much everyone!
I'm setting up a container to keep the mice in right now and as soon as the stores open here I'll be heading down to get them.

The mice I had been getting seemed an okay size but I'm glad I posted here.

I'm thinking maybe she was born in August or early September based on mercerasian's snake size and DrDooLittle's snake size.
It's a pretty big weight difference. I've also looked on their site and the weights of the availables are a big difference as well from what I was told and what her weight is.
Who knows maybe they made a mistake.