Is my ball python underweight?

[Polarpaw]

I bought my ball python (found out it was a girl through popping a few weeks ago) at a popular pet store back in March. The pet store kind of screwed up and ended up forgetting to charge me for her, so I never ended up with any of her paperwork and there I have NO Idea how old she is. I've had her for about 2.5 months now.

Since I've had her shes eaten regularly every 5 days, without missing. She is currently on hopper mice, and by comparison between the mouse and her girth I think it's the right size of mouse for her. She defecates regularly and healthily, she's extremely social, and she has shed twice since I've had her. The temperatures and humidity in the cage is accurate so that's not the problem.

I forgot to weigh her when I brought her home due to excitement, but I weighed her this morning and she is 105 grams or 3.7 ounces. After reading a lot of other people's python's weights on the Internet this morning I've kind of gotten scared that she isn't where she should be in weight.

Is this the case?

When I got her she had mites but I treated her, the enclosure, and the entire too she's in for them and haven't seen them since.

Any advice will help!

[Inarikins]

You've had her for 2.5 months and she's still 100 grams? I would say yes, she is underweight. Do you have a picture of her? At 105 grams she should be eating a 10-15 gram rat pink every five days. Hopper mice are too small for even hatchlings, most do start on rat pinks. You want to feed her 10-15% of her body mass every 5-7 days.