Mandy Sellars suffers from a rare condition called Proteus syndrome, which is thought to only affect about 120 people worldwide. 

Her legs and feet, weighing 70kg, continue to grow while the rest of her body remains average size.  Because there is no known cure for this condition, doctors may need to amputate in the future, however, Sellars wants to raise the awareness of this condition before any such thing is done.