She recovered.
So, was this something to do with the medical care she was given? Or was it something that occurred with no scientific explanation? Has any medic investigated the circumstances to see whether scientific medicine could heal her, if she was to present to a doctor today?
Right. Not really healing then.
Why 'not really healing then'? Are you saying that 'healing' has necessarily to be 1) merely physical and 2) total? What about those who have untreatable conditions and are, understandably, fearful of the future. If that fear is overcome, isn't that healing?
If a person prays themselves wouldn't this display faith just as much? Suggesting sin is a factor in illness is not something I could consider.
It might well be worth your rethinking your position, then, Maeght. What about the driver who is driving at, say, 60mph in a built-up area where the speed limit is 30, perhaps even 20; loses control of the car and has an accident causing serious injury to themself. After a while, their injuries lead to kidney failure. Are you honestly suggesting that 'sin' (aka wrongdoing) isn't a factor in that illness?
Or, what about the child who develops lung cancer as a result of living with and inhaling the exhalations of two heavy smoker parents? Isn't the condition tied to the 'sin' of those parents - especially if they have been warned about the potential consequences by friends and medics and refused to act on that advice?