Appropriate feeding size?

[dakski]

Hi, we added this new girl to our collection. She weighs in at 865g. I asked the breeder what size she's eating.... she said rat pups. I personally feel like this is way small? Am I wrong? What size would you recommend? I saw possibly a small or medium rat? Tomorrow is feeding day trying to figure out all our beforehand. Thanks!
https://ibb.co/fvJ4C18

At 865g, I would be feeding a small rat every 2 weeks. That assumes she’s a healthy 865g. If overweight same size but less frequently. If underweight every 7-10 days.

For her, per picture, I would feed a small rat every 10 days if she will take it. If she skips meals, go to every 2 weeks.