Although Chancellor Merkel currently reigns as the Iron Lady of Europe, her actions are constrained by German domestic politics. There is an election coming up next year, and there are signs that the "chancellor's majority" is no longer holding:
The focus instead was on the 23 lawmakers from Chancellor Angela Merkel’s own center-right coalition who voted against the measure, robbing her, for the third consecutive vote on Greece, of the so-called chancellor’s majority, or absolute majority among her government’s own deputies.
While not relevant for Friday’s vote, the chancellor’s majority is widely seen as an indicator of the strength of the incumbent’s power base, because most legislation put before the lower house of Parliament requires only a simple majority of those voting. Missing it on three votes in a row on one policy matter, in this case, Greece, is unusual.
“The missed chancellor’s majority is a clear sign that even if one wants to be a good colleague, even her party colleagues do not agree with her government’s policy of pushing these packages through Parliament,” said Manuel Becker, a political scientist at the University of Bonn.