I know that all snakes grow at different speeds, but the three balls I have that are ~300g were born around august-november of 2012. And the year-and-a-half olds I have are ~700-1000g. Not to say that it's not possible, but it does seem pretty small. She's probably not as old as they claimed, she looks too healthy to be underfed.
ETA: as far as breeding goes, once she is sitting comfortably at a good weight (at least 1500g) its usually pretty safe. Just make sure she looks nice and chubby!
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