The accident occurred in Ahoada on the East-West Road in Rivers State.
Others who died included Consider Amadi, a former Woman Leader in Ogbia; Clara Abila, a grassroots politician; Immaculate Amasimua, a former Commissioner in the Bayelsa State Civil Service Commission; Zimbra Goma, a former Commissioner for Women Affairs in Bayelsa State; and Hon. Ruby Benjamin, a former member of the House of Assembly representing Brass Constituency 1 of Bayelsa State.
The victims were returning from Port Harcourt in Rivers State where they had gone on a two-day solidarity visit to Dame Jonathan.
The Sector Commander of the Federal Road Safety Commission in Bayelsa State, Vincent Jack, confirmed the development.
Jack spoke with newsmen on the telephone on Sunday.
He, however, said only nine persons died in the fire that engulfed the vehicle in which the victims were travelling.
The accident occurred when the tyre of an oncoming Toyota Sienna van exploded and the car rammed into the bus carrying the women.
The bus burst into flame immediately.
The coaster bus in which the women were travelling bore the inscription, Women for Change Initiative, a non-governmental organisation promoted by Dame Jonathan.