Your question is far too general. We don't know how long the snake is, or how old it is.
A long skinny snake shouldn't be breeding. I wouldn't breed a 1300 gram snake under 4 years of age. It sounds like she needs another year to finish growing up.

There are reports that many snakes bred small continue to lay small clutches even as they grow larger. I won't breed a snake under 1500 grams. If they're 1490, I'll start them breeding, unless they go off feed--I expect they'll top 1500 within the month. But 1300 is really iffy.

I know there are people who breed at 1200, but I disagree with it...a snake that size is just too small.