Argunov had only 20 days to paint this if it was done in 1803. She does look worn. But it could also have been painted in 1802 or earlier or it could be that Argunov took some artistic license and removed signs of late term pregnancy.
From Wikimedia.
Praskovia carries a purse in one hand and a fan in the other. Her cap has a strap and covers the head, extending back, making it a bonnet.
Keywords: Argunov - Nikolai, Praskovia Kovalyova-Zhemchugova, P. I. Sheremeteva, Прасковья Ивановна Жемчугова, графиня Шереме́тева, Countess Shermeteva, Kovalyov family, Shermetev family, Countess, Russian, lace bonnet, strap, draped necklace, cameo, bodice, clasps, belt, jeweled buckle, natural waistline, close skirt, wrap, fan, purse