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The actress will star in the new series of the show as Vivienne, the domineering mother of Katie (Sarah Parish).
She told What's On TV: "Vivienne appears to be a bit of a cold fish. She seems to be selfish, critical of Katie and not very motherly - but soon all things are revealed."
The former Absolutely Fabulous star explained that her appearance on the show would shed more light on Katie's past.
"You begin to get the idea that Katie's childhood, while it was happy, had some secrets and strangeness in it, and that they never really got on," she said. "It's quite tense and very well written."
"[The audience will] get a real insight into why Katie is Katie," she added.
The new series of Mistresses begins on Thursday, August 5 at 9pm on BBC One.
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