Parkinson's kyphosis
Poor Germany.
https://abruptearthchanges.com/2018/05/02/germany-conservative-politician-arrested-in-advance-of-may-day-demonstration-because-his-bodyguard-carried-pepper-spray-legally/
It's possible.
Given that she failed to address her health properly – for years – she may be in such bad shape she has no choice.
Obviously, this is all speculation. It might be a more serious medical device or a bulkier bulletproof vest as others have suggested.