This one scenario actually makes slightly more sense to me than an accidental overdose of meds coming from a trained anesthetist.. . .But her interview was seized on by detectives as valuable evidence in the profile they are building of her.
Officers are seeking medical records to build up a case that she was incapable of controlling four-year-old Madeleine - and that the strain could have provoked her into violence while on holiday in Praia da Luz. . .
To be fair and before I proceed: The parents may yet be innocent of perpetrating a crime against their daughter. At this point I am only looking at possibilities and not making accusations.
Whenever I look at a possible scenario for the parents to have caused the death of Madeleine anything to do with meds sounds like a remote possibilty unless one thinks that a sedated person might fall off a bed and break her neck since heavily sedated people often cannot even get out of a bed without falling and getting injured and it is one mistake that I have actually seen medical pros make with patients (leaving them alone on a bed or even a reclining chair/bed while heavily sedated after a procedure.)
Although the violence as a cause is at least something that sounds a bit more possible to me, the violence scenario is not something that seems highly likely to me at this point in the case but then I do not know about the mother's psych records or her past behavior with Madeleine that might not be public knowledge.