From your description, it sounds like your mother could use some support from you. It is notthe normal "follow up" for any hospice to keep in contact with the family of the deceased in the way you describe. Hospice offers bereavement follow up care for up to one year to support families during the grieving process, or through mailed satisfaction surveys. That is what hospice care signifies: caring and support when cure is no longer an option"”for your dad, and now for your mom through bereavement care. What you are describing should never happen.
If you suspect your mother is being taken advantage of, such as someone trying to get money from her, please contact her local County Department of Aging. There are strict rules, and fines and even jail time, for persons who abuse elders. It is called Elder Abuse and can be physical, sexual, emotional, or financial. Also, please alert the hospice who cared for your dad and let them know what is happening.