According to dailymail, Amy’s father Mitch has talked about his daughter illness.
It seems that Amy is suffering from emphysema and she is in great danger if she will not stop taking drugs.

There is one possibility that Wino could never walk again and spent the rest of her life in a wheelchair. She could lose her voice and she could die.

Emphysema – usually caused by smoking – is a progressive lung condition which ages the lung’s prematurely and leaves sufferers struggling for breath.

The damage caused by the disease is irreversible and can lead some sufferers to become dependent on oxygen supplies.