Her aides dismissed the incident as dehydration but Mrs Merkel was once again seen overcome with tremors during an official ceremony at Bellevue Palace - the German President's official residence in Berlin - less than two weeks after the first accident.
The deputy spokesperson for the German government, Ulrike Demmer, denied Merkel's health problems, reiterating several times during a press conference that "the chancellor is doing well".
"I feel very well, there is no need to worry", Merkel said, adding that she was simply still in a phase of "processing" a previous shaking spell, but that "there has been progress".
Merkel told reporters following the episode that she was "fine" and suggested that the psychological impact of the first incident was responsible for the subsequent episodes. "Beyond that, I'm firmly convinced that I'm very well capable".
A week later she suffered a similar bout of trembling during a ceremony at the German presidential residence at Berlin's Tiergarten park.
According to the Focus website, the shaking affected her whole body and lasted over a minute.
"I believe that just as it happened one day, so it will disappear".
Merkel, 64, has served as the Chancellor of Germany since 2005.
Mr Cornelius urged the Chancellor to "explain" why she keeps shaking as "concern is growing" among Germans over her health.
The health of public figures in Germany is generally regarded as private due to strict privacy laws.
Veteran TV actor Walter Sittler will be seen playing German President Frank-Walter Steinmeier, while upcoming actor Orlando Suss will star as the Austrian Chancellor Sebastian Kurz, both of whom played key roles in the crisis.
Frequently called the European Union's most influential leader and the most powerful woman in the world, Merkel has said she will leave politics at the end of her term, in 2021.
In the past, Merkel has joked that she is a "sleep camel" who can go days with just a few hours of sleep as long as she gets a full night of sleep at the weekend.