Hi, my name is*****'m a certified appraiser and I'd be happy to help.
Maxine Borowsky was a 20th century California artist, also doing costume and theater design.
She was also an art therapist.
Unfortunately, her work hasn't retained any significant resale value--I can't find any resale records at all over the past ten years.
I can certainly value the work based on sales of watercolors of like kind and quality, by other artists with some reputation but little sales/market recognition. To do that, I'd need you to upload a photo.