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Yes. Taxes would need to be filed for 2014 and possibly for 2015 from the beginning of the year to her date of death.
If she had a will, that would determine who would be responsible for settling her affairs, including her tax return
If her son is her only heir, and their is no will, then whomever is in possession of her property
(in this case usually her son) would be responsible for filing her tax return. If there is a probate estate (assets
held in her own name) then depending upon whether or not there is a Will would determine who the court would appoint as her Personal
If anyone has her Power of Attorney, that person could manage her affairs, file her tax returns
, etc., as long as she was alive. Any Power of Attorney becomes ineffective at her death.