Doctors tried to resuscitate her but she died around 20 minutes later.
Mrs Glynn, a self-employed hairdresser, said: “We’ll never get over the pain of losing Mia especially in the way we did.”
“Our hearts hurts every second since Mia’s heart stopped.
“But we will always make sure Mia will be remembered in the most special way.”
Mr Glynn, an engineering teacher, added: “Seeing Mia in her final moments was awful.
“We feel so blessed that she was our daughter but are completely heartbroken that Mia was taken from us so soon.”
The couple said their focus now was on raising awareness of the dangers of sepsis.
More than £40,000 has been raised in her memory through a variety of fundraising events and the family has donated more than £16,000 to the UK Sepsis Trust.