Lynn Gilderdale had suffered from ME for about 17 years
The mother of a prominent ME sufferer and campaigner has been arrested on suspicion of murder following the death of her severely ill daughter.
Kay Gilderdale, 54, was questioned and released on police bail after the death of Lynn Gilderdale, 31, on Thursday.
Sussex Police were called to Ms Gilderdale's home in Stonegate, East Sussex, at about 0830 GMT.
Ms Gilderdale had been campaigning for a better understanding of ME, which she contracted about 17 years ago.
Her family, who issued a statement through Sussex Police, said: "Lynn was young, beautiful, loving and caring.
"At the age of 14 years she was struck down by ME - an illness greatly misunderstood - and, as a result, suffered the stigma attached to this dreadful illness.
"She fought long and hard for 17 years with immense bravery, enduring constant pain and sickness. Every system of her body was affected."
Ms Gilderdale required 24-hour care, but still had time for others, her family said.
"She was a much-loved daughter, sister and granddaughter who, despite her illness, always gave love and support to others," they continued.
"In life Lynn strove to help the medical profession improve their insight into ME, which affects thousands of people in varying degrees of severity."
Rother district commander Ch Insp Heather Keating said: "This is a very tragic incident, but we are not looking for anyone else in connection with it."
Mrs Gilderdale has been bailed until 6 March, 2009.
Her daughter fell ill after receiving a vaccination for TB when she was 14-years-old.
She then went on to have bronchitis, tonsillitis and glandular fever, before being diagnosed with ME.
The condition, which is also known as Chronic Fatigue Syndrome, often left her unable to get out of bed.
The ME Association estimates that 250,000 people are affected by the condition in the UK.