It means she has to fight to get measures to do with bailouts through the Bundestag.
With five parties in the Bundestag, the make-up of the next government could become a lottery.
The chancellor has a majority of only nine in the Bundestag, parliament's lower house.
But it is not up to the Bundestag to solve the problem, Germans think.
ECONOMIST: Why Germany is so reluctant to stump up for the euro
The Bundestag, the lower house, can then do little more than feint at reform.
The court has let the euro rescues through, while strengthening the Bundestag's role in approving them.
The crisis in the euro zone forced Mrs Merkel to push colossal bail-outs through a reluctant Bundestag.
This has been pretty much how the German Free Democrats have clung on to their Bundestag seats.
Chancellor Merkel stood before the ranks of the Bundestag yesterday and declared it "a good day for Europe".
More than 500 French MPs will travel to the German capital for a joint session with the Bundestag.
Norbert Lammert, the Bundestag's president and a member of the CDU, called for raising taxes on top earners.
What happens this year and next will be decisive, says Rainer Arnold, an SPD member of the Bundestag.
It is on this point that German reforms are stuck, despite the Bundestag's authorisation of buybacks last March.
He wants the German Bundestag to step in with a statute to clear up any doubts or anxieties.
After the final vote in the Bundestag chamber of the Reichstag building, Mrs Merkel expressed confidence in her candidate.
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So we might have the prospect of the full 622-member Bundestag scrutinising EFSF bond-buying on a pretty specific basis.
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Several other euro-zone parliaments must also approve the bailout including, crucially, Germany's Bundestag.
Schemes to raise the debt burden on Germans without Bundestag control, such as Eurobonds, do not pass constitutional muster.
ECONOMIST: Why Germany is so reluctant to stump up for the euro
The Bundestag now sits in Berlin in a building with a glass dome.
German Chancellor Angela Merkel staked her reputation in the Euro rescue, getting the extended EFSF ratified by the Bundestag.
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German Chancellor Angela Merkel welcomed the agreement, telling the Bundestag (lower house of parliament) that Germany's "core demands" had been secured.
Helmut Kohl, Germany's chancellor, insists the government will still force the gold-enhancing law through the Bundestag, the lower house of parliament.
Merkel's party came in first in the September election, but only by a couple of seats in the Bundestag, or the parliament.
German unification reduced Bavaria's share of Bundestag seats from 18% to 13%.
Volker Kauder is one of the more forthright members of the Bundestag.
The Bundestag's approval is almost certainly conditional on International Monetary Fund involvement.
In recent rulings the constitutional court has pushed the Bundestag to be more assertive when power or money is transferred to Europe.
ECONOMIST: Why Germany is so reluctant to stump up for the euro
Under this system the Bundestag is meant both to link voters to a local representative and to reflect their overall political preferences.
The Bundestag, or German lower house, voted by 319 votes to 73 in favour of Germany's participation in the bail-out, with 195 abstentions.
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