Can a handwritten Will be disregarded if someone created a pour-over Will?

Question Details: Recently there was a death in the family and my grandmother's sister wrote a Will, after her death at the Will reading their great niece had a pour-over Will read and that Will left everything to her and her husband and a very small percentage to my grandmother. When I say everything I mean everything down to her house and bank account which while my great aunt was alive she refused to allow her to add herself to. Are any of these actions legal?

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