Vyleen White's family are shocked about details of her death and her killer's "weak" sentence. Photo: AAP PHOTOS

The family of a murdered grandmother has slammed her teenage killer's sentence, reeling from new details of the vicious attack that triggered landmark law reforms.

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The Queensland government has already indicated it will consider appealing after a teenage boy on Thursday received a 16-year maximum sentence for the attack on Vyleen White.

The 70-year-old was fatally stabbed by the boy - then aged 16 - in front of her young granddaughter outside Redbank Plains shopping cent

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