Police are investigating claims that Bettencourt's adviser gave envelopes of cash to French President Nicolas Sarkozy and Woerth.
Woerth and Sarkozy have both denied the allegations, which resulted from secret recordings that surfaced last month.
The recordings, allegedly made by Bettencourt's butler, also refer to a bank account in Switzerland containing 80 million euros ($98.3 million), which had not been reported on Bettencourt's taxes.
Woerth's wife, Florence, was questioned last week, the spokeswoman said.
The secret recordings published last month revealed that Florence Woerth was, until late June, the deputy to Bettencourt's financial adviser, Patrice de Maistre.
CNN
