It's pretty much impossible to tell based on weight and length since ball pythons grow at different rates. I will say that she is most likely not one. It takes 2-3 years for a female ball python to be fully grown.
There's unfortunately no way to tell for sure. Welcome to the forum by the way
Edit: How did the rescuer get that estimate anyway? Is it just a random guess? Because ball pythons can live 20+ years so she could easily be almost any age.
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