A megachurch in the US has asked followers to pray for the resurrection of a young girl - and to send money, in case they're successful.

In a post to Instagram earlier this week, mother Kalley Heiligenthal said they "believe in a Jesus who died and conclusively defeated every grave, holding the keys to resurrection power".

"We need it for our little Olive Alayne, who stopped breathing yesterday and has been pronounced dead by doctors."

Olive was two years old when she died in unclear circumstances, US media reported.