"She was not walking around delusional, which is what we really want the public to understand," she said.
Police said Carey led Secret Service and police on a car chase from the White House past the Capitol, trying to penetrate the security barriers at both national landmarks.
In a CNN interview on Monday morning, Eric Sanders, the lawyer representing the two sisters, rejected the suggestion that Miriam Carey is partly responsible for her own death.
"She didn't contribute to anything," he said. "She had absolutely every right to be in the nation's capital."
The issue is how police handled the matter, he said.
Police in Washington say they're reviewing the encounter and the use of deadly force.
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