I think one reason why many of us ask for a method that is suited to miracle claims that seem to fall outwith currently used methods and knowledge is in recognition of the possibility of there being an explanation via some alternative method(s) that involve suitably disciplined investigation that could convincingly (in terms of the method used) demonstrate divine intervention, and until then 'unexplained' or 'don't know' are reasonable positions to hold.
However, there is a prior step - and one that I keep banging on about - which is that the initial claim is free of the risks of mistakes or lies, or indeed other aspects of human artifice which might cast doubt on there being an actual 'something' to investigate, as opposed to there being just claim of this 'something'. These are very real risks and I've yet to see these being adequately dealt with by proponents of miracle claims, and especially where these events date to antiquity and where the evidence is anecdotal and in revered ancient texts so that fallacious arguments from tradition and authority are risks too.
I'd have thought that proponents of miracles would do better to develop methods to investigate more recent claims since if it were possible to confirm divine intervention in current circumstances, where both the details of the claimed miracle event and role of witnesses and supporters of the claim are amenable, this would surely aid the case for possible divine intervention in circumstances that are no longer amenable to investigation.
Unfortunately, in reading around the background to the claims involving the subject of this thread just by doing an internet search, there are seemingly reports by both the doctor who treated her and her husband that this woman recovered via medical intervention, and also a report that the case notes containing the details of her medical treatment are with the nun who is running the operation in Calcutta - so it seems to me that in spite of the RCC making her a saint there is a risk of deception in this case that hasn't been addressed.