Nan’s husband Frank died in 1929 or 1930 and she gave up vaudeville soon after. Sometime in the early 1930s she remarried, to a man named Al Lambell, who she described in a letter as, “a nice little old Pal and very old-fashioned.” They lived in Seattle. She did not remarry when Mr. Lambell died in the 1940s.
She moved to San Bernardino in 1954 to be near her brother. Nan Aspinwall Gable Lambell lived in Southern California for the next ten years, until she passed away on October 24, 1964.
By the time of her death her daring cross-country ride in 1910 was largely forgotten, except when the TV series Death Valley Days used her story for an episode in 1958 (Season 6, episode 18). Nan consulted on the story (though it was probably mostly fictional), and she appeared in the introduction with the host, the “Old Ranger,” Stanley Andrews.
I wish I could give you a link to the episode, but I don’t know where to get it free. It seems to be available on the STARZ network. Here is a still from Imdb.