Amy Parr (32), of Halifax Drive, has already received pledges of more than £1,000 for the Epilepsy Society ahead of her challenge later this month.
Daughter Lillie (12) had her first bad seizure in 2012 and Amy said she feared she would not come out of the resuscitation unit alive.
The second incident happened during the following January, when she was cared for in the children’s intensive care unit for two days.
Amy said: “There were moments during these two very severe seizures when I was worried my daughter wouldn’t make it.
“Lillie was lucky but I know there are other families out there that are not so lucky and I wanted to be able to support a charity that is able to help them through this troubling time.
“That’s why I decided to run the marathon – my target is £2,000 and I am already half way there with the sponsorship.”
Lillie, a pupil at Long Field Academy in Melton, had no seizure activity for a while until she started having absences – sudden losses of awareness – two years ago.
She was having more than 10 a day and was then diagnosed with epilepsy and given medication to manage the condition.
Amy added: “Lillie is responding well to medication and is now able to do everything that other children her age do, apart from being shadowed by the anxiety she is left with as a result of this trauma.”
You can help. Go to www.uk.virginmoneygiving.com/giving and type in Amy Parr to sponsor her run in the London Marathon, which is on Sunday April 23.