It is understandable that your aunt may be mad if you have been sending her messages about your grandmother dying and questioning your dad's involvement in it, even if it was in the form of a voice clip. Depending on the specific details of the situation, your dad could potentially be charged with elder abuse or neglect, neglect being more likely, given that your grandmother starved for 11 days after her stroke. Your aunt is likely to still be mad at you for sending her these messages, and it is ultimately up to her whether or not she chooses to forgive you, as forgiveness is a personal decision. It is possible that she can forgive you if you are apologetic and take responsibility for your actions.