New to BP have a few questions

[Caali]

It was a fuzzy mouse, at the suggestion of the kid checking me out. It was definitely smaller than her girth, but he said the babies were getting 2 pinky mice per feed. Should I try a larger one? Also, how many weeks is too many for a baby to go without eating? She was just 67g when I got her.

Personally I would try a bigger one instead of two small ones and I would not try to feed life just yet. From my experience it can be very difficult (in rare cases even impossible?) to change to F/T afterwards.
You can feed young ball pythons every five days if you want to. I know a lot of people do that and personally I did it myself until my little snake reached the 500g mark. So, in my opinion, can try feeding again on Sunday.
How old is your snake? In your photo she looked fine and, unless she is loosing a lot of weight, she will be able to go for some time without food. For now you don't need to worry.
But I have three more questions:

How did you prepare the mice?
Did the breeder tell you how he prepared the food and what she ate (frozen or life)?
Did she seem interested at least or was she ignoring you (or was she even defensive)?