Dressed in a niqab, which she removed to confirm her identity, she also indicated a plea of not guilty.
Margaret Charnley, 67, of Bristol, was not at the hearing because she was excused from attending, but a lawyer indicated a plea of not guilty.
He did not indicate a plea and his case has been sent to Leeds crown court, where he will appear on 21 May.
A mid-pitched meow may indicate a plea for something like food or water.
The charges against the activist, James O'Keefe III, and three other men were made public in a bill of information, which often indicates that a plea deal has been made.
"We have indicated a guilty plea today as Network Rail took on all of Railtrack's obligations, responsibilities and liabilities when it took over the company in October 2002, some five months after the accident," a spokeswoman said.
Mr. Garrido had been widely expected to plead guilty to all counts after a lawyer for Mr. Garrido's wife, Nancy, indicated that a plea deal had been reached.
Wearing a black hijab, she indicated a not guilty plea.
But should they lose, the strategy could also create serious risks for Dr. Lee's defense, particularly since his lawyers have indicated a great reluctance to plea bargain.
However, some observers said the guilty plea by Halliburton may indicate a weakness in its position in negotiating a settlement.
