Ebony, 8, a pupil at Handale School in Loftus, wanted to donate her hair for her sister to have a wig in the future if required.
She has raised more than £1,000 for the trust.
Jasmyn Moore, owner of Vanity hair salon in Staithes, cut Ebony’s hair free of charge – and chucked in a little trim for Blossom too as she wanted a cut like her big sister’s.
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The Little Princess Trust provides free, real-hair wigs for young cancer sufferers or for children and young people experiencing the devastating effects of hair loss.