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Letizia only wants to be a princess during office hours,” said Mr. Penafiel. “Queen Sofia has been a queen 24/7. She gets up as the queen, and when she goes to bed, she is still the queen.”

Luis Menendez, 39, said Letizia’s problems stem from the claustrophobic and anachronistic nature of the royal household. He and many others want a referendum to decide whether Spain should become a republic instead of a constitutional monarchy.

“Society’s perception of Letizia is that of someone who had a big break in life, just like many Spanish politicians or members of financial institutions that have enriched themselves in recent years,” he said.

Even members of Letizia’s family are calling for abolition of the monarchy. The future queen’s aunt recently joined the pro-republic side of the debate on her Twitter account.

But the Spanish Constitution is not likely to change in the near future. Eighty-five percent of parliamentary lawmakers favor the status quo.

In a bid to improve its public image, the Spanish royal household is trying to adapt.

The palace recently opened a Twitter account. Felipe’s coronation is likely to be modest, reflecting the severe austerity measures the government has imposed on the public. The presence of the couple’s daughters — Leonor, 8, and Sofia, 7 — could add warmth to Letizia’s image.

Felipe’s biographer, Mr. Apezarena, said Letizia will have a chance to prove herself once she is queen, and he predicted she will ably fill the role.

“Once she becomes the queen, she is going to relax,” he said. “Up until now, she has tried to prove herself because she was only the candidate. Once she becomes the queen, Letizia won’t have to please everybody.”