Ms Baker-Earle said she was in hospital with Covid and pneumonia last November, around the same time Grace also had the virus.
"Grace was very unwell for a couple of weeks, she lost half a stone and was really poorly - she weighed 6.5 stone (41kg) to begin with.
"A cardiologist has said although Grace had a virus earlier in March, having Covid pushed it over into having ME."
ME is a chronic neurological condition which means day-to-day tasks can be "exhausting" for Grace, she added.
"People were so dismissive of such a serious thing we are dealing with, which makes my blood boil," she added.