Well, Bavarians might disagree with both "moral principles" and "right wing". Especially CDU is hardly "right wing".
Some Bavarian politicians may have other moral principles. But Merkel defended the German constitution which has no limit for asylum seekers and she also followed her christian upbringing.
THE whole CDU is clearly not right anymore, but take Erika Steinbach as an example of the (former) right wing. Or the critics from the CSU. There is also a large group of voters right from CDU/CSU - a voter domain which other politicians from CDU/CSU also claim(ed) for themselves. Politicians from the CDU moved to the AFD ... a prominent example is Alexander Gauland, who was 40 years member of the CDU.
It is rather right wing in a global context. If you don't think they are right wing, you might want to recalibrate your views of what you think of "centrist".
Populism is a mode of political communication that is centred around contrasts between the "common man" or "the people" and a real or imagined group of "privileged elites", traditionally scapegoating or making a folk devil of the latter.
Merkel does not scapegoat elites.