Merkel's Grexit U-Turn?

Chancellor Angela Merkel has, apparently, made a U-turn wrt her policy on Greece.Faced with the political fallout from a Greek exit before German national elections in 2013, she now wants to stop Athens from leaving the euro zone at all costs (even if it means massaging the figures in the upcoming troika report).That at least is the theory according to Der Spiegel.However, I remain unconvinced.