“No person shall...be compelled in any criminal case to be a witness against himself...”
The House Republicans are wrong on this issue. She has the right to invoke the 5th at any point. The only way to “waive” it is to answer a question. The 5th is also called “the right to be silent.” This means she could answer some questions but not all.
she wasn’t silent
Sorry. But she was asked questions, after making her self-serving statement. She was asked to confirm whether certain documents were, indeed, what she had certified them to be.
She answered willingly.
She's SOL on the 5th Amendment.