How was she the factor when her party tried to block the vote? She is party leader and cancellor, your party doesnt work against you in this casePeople criticizing merkel dont understand that she was one of the factors why this was possible. Merkel allowed the CDU congressman to vote freely which is the sole reason why this was possible. If she insisted on a partyline the vote would have been very close (in particular because some congressmen are already in their vacation and some are sick)