Williams test driver Susie Wolff admits she is considering her future in Formula 1 as her dream of making it onto the grid appears to be slipping away.
Wolff entered Formula 1 in 2012 when she was named Williams development driver, but she had to wait until 2014 before she was given Friday practice outings.
She was promoted to test driver for the 2015 campaign and has had a couple more practice and test runs, but she wasn't considered as a replacement for the injured Valtteri Bottas at the season-opening Australian GP with the team insisting she is their test driver not reserve driver.
Williams have since appointed Adrian Sutil as their back-up driver and Wolff admits her chances of making it onto the grid next year appear to be non-existent.
"I can't wait on the sidelines forever for my chance," she told the "Women in F1" edition of CNN's The Circuit.
"There doesn't seem to be many opportunities for next year to get onto the grid. This is going to be a winter of reflection because either it happens or it doesn't."
Asked about making the step up, she replied: "I'm very ambitious but I'm also very realistic.
"It's going to be tough. It's going to be very tough."