A 999 call reveals a four-year-old saving her mum's life by dialling for help and opening with the line: 'I'm just having a bit of my lunch'.Little Mya made the emergency call after she witnessed her mother, Rachel, 25, collapse on the floor.She had only been taught about 999 at school the week before and was home alone with her mum.Her mother suffers from a Functional Neurological Disorder, a condition which can cause stroke-like symptoms and seizures.Source: SWNS