1. This is WAY too long for a blurb.
2. It gives way too much information.
3. Write it when you've FINISHED.
Go for something more like:
Madison is a 6-year-old suffering from a rare form of leukaemia - it's killing both her and emotionally destroying her pregnant mother, Lauren. But as a new baby comes along, Lauren realises that her daughter will need a heart operation which offers only a 50% chance of survival. With no husband, how can Lauren stand the pain of both her daughters' lives being at risk?
