Notice How I said “can be”. A family member has a pole lamp. The lamp is at chair height. Her hands are arthritic, but she can do some crafts when her hands are warmed by the lamp. Without it she can’t. Bet you never thought of that one.
Of course, I’ve thought of and used it when I didn’t have proper heating years ago, as a reader I had my 100-watt bulb close to my head.
If things get worse for her look into the various forms of heating pads and rubber mats that are heated that would make a warm table covering for her, and consider rigging up a heat lamp for her work area.
A pedestal lamp with a directed heat lamp might be the ticket for her, as well as an electric floor mat for her feat and/or a heat panel under the table (a warm body helps the hands), you can really come up with great solutions to a stationary work table if you look into all that is available.