This is a mid 19th century, or Late Qing Dynasty, Chinese Ancestor painting. In lieu of photography, portrait studios in China recorded images of family members by painting them. This would have been accompanied or paired, usually with a portrait of the husband.
Since they were painted in professional studios of sorts, most are not signed and the artist cannot be traced usually.
On today's market, a 19th century Chinese ancestor painting can sell for as high as $700 - $1000. The suggested insurance or replacement value is $2000.
Here is a link for you to an example of a pair of comparable paintings that sold for $1500 for both together:
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