My name isCustomerand I would love to help. The next step would be for me to see pictures of the painting,and any labels on the back of the framing. There was only a pic of the signature in your original inquiry.Use the Add Files feature on your screen to add pictures one at a time.
This is an original watercolor of pheasants created in 1981 by an artist that used the cipher CHP. The signature looks to read CHP (copyright symbol) '81.
I have searched the paid artist databases for listed artists using this cipher and there are no results. I also used CHD and a few other possible combinations, also with no result. I also used the image of the painting to do a Google image search to find similar works and also no result.
This painting looks to have been done by a regional artist that was likely from the area where your mother lived.
This painting has a current value of $200 to $300 retail value.
It is important for you to click the stars after you have read this answer.