The team said on Monday the 31-year-old wife of Mercedes motorsport head Toto Wolff, a former Williams executive director, would remain their development driver in an expanded role that will include two Friday outings.
However, Williams did not say which race weekends Wolff would be appearing at.
"I'm grateful for the support and belief Williams continue to show in me and 2014 promises to be a very important milestone in my career," said Wolff said in a statement.
"Competing in two first free practice sessions, alongside an additional full test day this season will be a big step and I am looking forward to the opportunity to get behind the wheel of the FW36 on a grand prix weekend."
Wolff, who raced for seven years in the German Touring Car (DTM) championship, took part in an official Formula One test for Williams last year and has conducted straight line aerodynamic tests. She has little chance of actually racing, with 21-year-old Brazilian Felipe Nasr the team's official test and reserve driver.
Brazil's Felipe Massa and Finland's Valtteri Bottas are the two main drivers for the team this season.
The last woman to take part in any stage of a grand prix weekend was Italian Giovanna Amati, who tried and failed to qualify with Brabham in 1992.
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