Her recovery has seen her learn to walk and swim again and posing in lingerie was, she says, a way of proving she can still live her life to the full In hospital, she was put into a medically induced coma, where surgeons battled to save her life and remove her infected, severely torn lower legs.
In an exclusive interview with Mail Online, Leah says she is adjusting to her life as an amputee and trying to decide what to do with her future Living at home with her parents, who have moved into a rented bungalow so that she does not have to navigate stairs, Leah has had to accept that her disability means her dreams of becoming a teacher may be over.
Despite having a state-of-the-art £60,000 prosthetic leg which allows her to walk unaided, the teenager still suffers crippling pain and fatigue after standing for long periods - making her teaching assistant apprenticeship difficult.
Myah, a psychology student, said: 'After losing my legs I could have just fallen into sadness and let it take over my life but I know I have to keep fighting for myself as well as my daughter.'With the challenges, I wanted to raise awareness and show that just because you're an amputee doesn't mean you can't do the same things that able bodied people can.'Before I lost my leg I could never do a handstand so I thought it would be fun to start with that and after doing that I knew I could achieve much more.'Since then, I've relearned to swim, drive a car, I've ridden on a motorcycle, walked a whole day with my prosthetic, learned to walk on grass, had a sexy photoshoot and more.'At first I debated whether to post the pictures where I was dressed scandalously online, in the beginning I never liked people looking at my legs and would always put a blanket over them.'But I wanted to show others that amputees can be sexy too.
It was one of the biggest steps I took in the challenge, but it was well worth it.
They were fined an initial £5million, and interim payments have covered Leah and Joe's medical and physio bills to date - but the pair have also submitted a 'substantial' compensation claim.
A spokesperson for Alton Towers told Mail Online: 'From the outset we have sought to provide assistance and support to those that were injured and their families.
'Those individuals who have not yet settled their claims have received significant interim payments.
Furthermore the company has regular direct contact with those seriously injured and continues to provide help and support wherever we can.' Leah added: 'Merlin have looked after me and my family so well.
To celebrate Limb Loss Awareness month in the US, she completed a series of challenges including revealing her legs in a saucy photoshoot, driving, relearning to swim, learning to do a handstand and more.