You have a lovely rocker, but sadly there is not much of a market for them and they are greatly undervalued and under appreciated. I see beautiful rockers sitting on Craigslist for months without selling. I think yours may be mahogany, and just looking at the style I think it's going to come in around 1890-1910.
There are some very similar ones on this page. Remember that the prices shown here are retail prices, what you would get on Craigslist would probably be about half of this, and only if someone really falls in love with it.
My suggestion is to treasure it for it's connection to your mother and pass it to someone in the family who will love it if you possibly can. For the few dollars you can realistically get for it, it's true value is much more sentimental than monetary. So sorry that I don't have better news on this one for you! It's a truly beautiful rocker, people just don't buy them much. I have one and love it!