If you are the person who would get a 1/3 share, then it is in your interest to ensure that she sees a solicitor and gets the new will done properly (also suggest that she sorts out POA if she hasn't already). She is free to change the will and write a new one giving a specific amount to each charity and the balance to the person - she needs to decide what she would want to happen if that person were to die before her, too.
All posts are my personal opinion, not formal advice Always get proper, professional advice (particularly about anything legal!)
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She is free to change the will and write a new one giving a specific amount to each charity and the balance to the person - she needs to decide what she would want to happen if that person were to die before her, too.