Her sucessor distances herself from Merkel and cut her out of campaings. Merkel systematicly is pushed aside.
Well all of Merkels recent decissions ended in failures.
Her energy politics give Germany the highest energy price in Europe. The economy starts to crack and is on the brink of a recession.
Her foreign politics are a failure as well. Germany broke with USA.
We are isolated in Europe in most decissions. France calls our foreign politics erratic and not trust worthy anymore.
Merkels biggest miscalculation was that she believed she can get Europe to take migrants from Germany. When she was unable to achieve this, Germany was overwhelmed to what happened and struck with 1.5 million migrants. This marks the beginning of Merkels star sinking.
Her mantra was, that borders must stay open and that she will be able to make a deal so other euroepan countries take migrants from us, to share the burden.
This did not work, she was unable to get that deal.
This gave the AfD the kickstart, divided the nation and brings us financial at the limit.
You might agree in this one point, that the fact that Germany took more migrants than all of EU combined
does not work and that Merkels failure to gain support for Germany is a bad thing.