Cancer Sympathy A Former Co-worker Informed Me That Her Mother Was Diagnosed With Cancer. Is Sending A Sympathy Card Tacky?

A former co-worker informed me that her mother was diagnosed with cancer. Is sending a sympathy card tacky? - cancer sympathy

I think think the map that would be more apporpriate to sign with a few words of encouragement and support. Sympathy, I think, is better suited for a death.
RN