It looked like Josus to me, so I looked it up and came up with this:
https://www.askart.com/artist/Joseph...ham_Josus.aspx
I tried to look for her signature but didn't see it. I figured you could look for her signature now and see if it matches. She did folk art and was known for watercolors it says, and she died in 1999.
Good luck!
Great piece regardless.