Thank you. Yes, she was always dubbed in her films, but I think she used to sing a bit in her nightclub act with her husband, Tony Martin. (Leslie Caron was dubbed in "Gigi," by the way, but she sounds just fine on the outtakes.)
Charisse played the love interest in the '52 non-musical "western" The Wild North". Her character performs the song "Northern Lights" in a saloon sequence. MGM recorded Charisse's vocal, but then used Ruth Martin's rendition in the final print of the film. Charisse's vocal is included as a bonus track on the film's soundtrack recording.