Yeah, at 2.3kg she can eat small rats every 2 weeks. If she happens to lose weight, which I doubt, you can always go to mediums every 2-3, as mentioned. I think she will stay stable, or gain, on small rats every other week, just at slower pace if she gains.
However, BP's are quite efficient and in the wild eat mostly African Soft Fur (ASF) rats. They do not get over about 90G.
When my female BP, Shayna, switched from medium rats every 2-3 weeks, to small rats every two, she actually gained weight. She stopped refusing meals except in winter fast, and ate more regularly. Easier to digest and better for her. She's 8 now and I switched her at 5 or 6 years old and she went from about 1.7kg to about 2KG.
Usually better to feed less than more with snakes.
Good luck and keep us posted. I think it will go well.
The BP feeding chart on here (below), is a good guide for size up to medium rats, IMO. I wouldn't feed mediums unless an animal was losing weight on small rats, or over 3-4KG, which is not too common, or after breeding etc. if the BP will eat them regularly. I also think weekly is too frequent once on small rats.
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