A section of residents of Mkwiro village in Lungalunga, Kwale County, have decried the rising sea level.
Anemia is a risk among expectant mothers worldwide.
Kibibi says she experiences nausea when pregnant, hence keen on attending antenatal clinics religiously least her situation turns worse.
Led by activist Sumeiya Omar, the protesters said they were not armed and they were only carrying manila papers, phones and snacks.
The decedents, reports say, were transporting Muguka, despite a ban imposed on the stimulant in the coastal region.
The body of the deceased was taken to Coast General Hospital mortuary.
Preliminary investigations indicate that the elderly woman had received Ksh.350,000 in royalties from Australia-based mining firm Base Titanium prior to her demise.