Sientje Mesdag-van Houten (December 23, 1834-March 20, 1909) was a Dutch painter and art collector. Sientje and her husband, artist Hendrik Willem Mesdag, amassed a collection of nearly 350 works.
Biography on the Online Dictionary of Dutch Women:
http://resources.huygens.knaw.nl/vrouwenlexicon/lemmata/data/Houten/en

Blauwe Vaas by Sientje Mesdag-van Houten
N/D / Oil on canvas / 49-1/5″x39-2/5″ / Private collection

Sientje Mesdag-van Houten on Artnet: http://www.artnet.com/artists/sientje-mesdag-van-houten/

Further reading:
https://www.codart.nl/guide/agenda/sientje-mesdag-van-houten-vrouw-van-de-haagse-school/
https://www.ienvanderpol.nl/sientje-mesdag/
https://www.demesdagcollectie.nl/en