Her sister, Stephanie Muite, did not specify the nature of her ailment.
Ms Muite spoke at Nanyuki Police Station where she had gone to seek police escort to transport the body by road to Nairobi.
Foreign Affairs Cabinet Secretary Amina Mohamed had mourned the passing on of Mrs Wamalwa.
The widow of former vice president Kijana Wamalwa, Yvonne Wamalwa, died on Thursday morning at Nanyuki Cottage Hospital while undergoing treatment.
Her sister, Stephanie Muite, said Mrs Wamalwa developed complications and was rushed to hospital where she passed on moments after being admitted.
She did not specify the nature of her ailment.
“We have been staying with Yvonne at my home at Ichuga Village since October last year and she has been [going to] Outspan Hospital in Nyeri Town for treatment.
“This morning her conditioned worsened and she passed on at Nanyuki Cottage Hospital,” said Ms Muite.
LEE FUNERAL HOME
Ms Muite spoke at Nanyuki Police Station where she had gone to seek police escort to transport the body by road to Lee Funeral Home in Nairobi.
The management of Nanyuki Cottage Hospital declined to talk journalists on Mrs Wamalwa’s death and referred reporters to the family.