Hello, my name is ***** ***** I am pleased to assist you with your art. Your artist, who is listed and who lived from 1889-1960 was very well known and respected for her watercolors. Although valued in the $300 to $500 range, many works in the past few years have sold on the open market in the $100-300 range. The market is a bit up and down, and has been for a few years, but in the long term her works should be relatively stable and worth holding on to. You have one of the larger examples, by the way, as most are about half those dimensions--so that will help retail value quite a bit.
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Have a blessed day!
With kind regards,Steve
If selling, you may wish to try the classified forums on a site like Askart.com, which tend to have a wide array of potential buyers.