How far had the Weimar Repubic recovered from its problems by 1928?

Answer 1

Effectively speaking, the Republic became a puppet by 1928 when considering the positioning, violence, and success achieved by the DNVP (the seeds of the Nazi party). Although Stresemann did manage to negotiate favorable terms over reparations, that included delayed payments, American loans, and removed occupation of the Ruhr through the Dawes and Young Plans, the extreme right did get away with garnish tremendous momentum.

This momentum started with the Kapp Putsch at the start of the decade and continued to snowball with the formation of the National Socialist German Workers' (Nazi) Party in 1920 which would grow to have 100,000 members by 1928. This party would merge with the DNVP in order to achieve substantial political integration, allowing it to argue and participate in campaigning for a Plebiscite against the Young Plan as well as turn over many of Germany's political offices unto party member equivalents.

After this, we all know about how the depression hit and Germany went into a tailspin with unemployment as well as inflation, how the reparation moratorium was put in place, and how desperation caused the Germans to rally around Hitler. By 1928 though, the Republic hadn't recovered at all. In fact, it had not even slowed down the hellbound misery Germany had been ensnared by. The Republic had only acted as a shield to allow institutions, firms, and financiers to sit by idly to Germany's crumble while they abandoned the country.