A couple of things to consider, a 1300 grms wont lay a big clutch, expect 4, 5 eggs. They lose a lot of weight after laying and they wont get much bigger for next season, so again few eggs next season. You will get smaller eggs and smaller hatchlings out of small mothers.
On the other hand pairing awakes apetitte, so she may win some weight.

I had a yb female with very bad feeding problems, after 3+ years and 900grms a put a male with her, they locked and she started eating like a pig. She layed 6 small eggs at 1300grms, all hatchling were fine. She is a great eater now.
As said before the bigger the better but I dont think its a sin to breed at 1300 grms. And it depends on each snake, she needs to be healthy no matter the weight.


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