Sorry, but you're still really short on facts here.
Where is the physicians involvement in this?
The nursing home, and hospice would not stop administering a medication unless a doctor wrote an order to dc it. If the hospice doctors was not also the patients facility doctor, the two colleagues would have conferred.
Did the nurses at the nursing home actually say to you "We stopped the medication because the hospice worker told us to."?
Is the hospice worker a nurse, an aide, a nurse practitioner?
Both hospice, and nursing homes have their own interdisciplinary teams of doctors, nurses, nurse practitioners, aides, social workers, therapists, dietitians, clinical supervisors, etc. When hospice comes into a facility, they have a contract with the facility as to how all practices are to be carried out, being very specific. When in a facility, the hospice interdisciplinary team works with the facility interdisciplinary team. Hospice attends the facility care plan meeting, they hold their own care plan meetings.
I find it extremely unlikely that one "worker", not even indicating what this persons credentials are, walked in, said "stop this medication" on his/her own volition, and those wishes were complied with by every staff member, dc'ing a medication.
Then again, you aren't apparently the patients legal representative, so you would not be privy to all the details.
If the patient is responsible for themselves at this time, they can be asking what the physicians involvement in all this was.