The only thing she could say, Merkel added, is that things were now much better than a year ago "when I anxious a great deal more".
Opinion polls have put her conservatives at a 15% lead over their nearest rivals, ahead of a national election set to take place on September 24.
Merkel's poll numbers rebounded as the influx ebbed to 280,000 previous year, restricted by border closures along the so-called Balkan route and a refugee accord between the European Union and Turkey.
German Chancellor Angela Merkel says that Europe still "hasn't done its homework" on long-term solutions to the flow of migrants to the continent.
Merkel's remarks, less than a month before the German election, suggest she has little appetite for the kind of sweeping overhaul of the eurozone that countries such as France have been advocating.
"I think we have a very interesting campaign", she said. She added she would not stop pushing for the fair distribution of refugees across the European Union. Merkel also touched on the European Commission's recent criticism of EU member Poland over judicial reforms, saying she took the Commission's criticism of Poland "very seriously" and would discuss the issue with European Commission President Jean-Claude Juncker on August 30.
She says "however much I want to have very good relations with Poland. we can not simply hold our mouths and say nothing for the sake of peace".
"Either we [in Europe] show solidarity with countries like Italy and Greece or this will have grave impact in the future", she said.
It was only the second campaign appearance by Merkel in formerly communist eastern Germany, where anti-foreigner sentiment is especially pronounced.
'We're a democracy and everyone can freely express themselves in public the way they want, ' she said.
This centre would be in Egypt, a so-called transit country for refugees and economic migrants aiming to reach Europe.
He also compared her to former German chancellor Helmut Kohl, who like Merkel, spent more than a decade in office. Mr Schulz, who doesn't have a position in Ms Merkel's administration, has said it's the government's job to avoid driving bans.
"I'm happy to say those two words out loud", she said.