Noted contents of your post.
Straight away you collate the relevant documents and/or information i.e., certified copies of consent letter, discharge summary, prescription, diagnostic test reports etc., from Hospital, if you can obtain CCTV footage, yes you get it.
In case if you have any difficulty in obtaining the same from Hospital, you may request them to provide the relevant certified copies by making an application under RTI Act.
Further more, if your wife goes to create trouble she has to prove her case beyond reasonable doubt of one and all.
Meanwhile, you gather as much information and documents as possible to support your case and be ready to face the unexpected.
As far as AB is concerned, it cannot be given on apprehensions.