Hello Ckeevafie52
It works with any Swiss Travel Pass type.
Just note, as I said before: on some mountain excursions, the Swiss Travel Pass (Flex) will grant a 25% or 50% reduction on the regular ticket. Your wife, however, would have to purchase a full fare ticket for such excursions, as the companion ticket does not grant the same reduction to her.
There are a few mountain excursions that are free for the Swiss Travel Pass and the companion ticket, namely: Mt. Rigi, Mt. Stanserhorn, Mt. Rochers-de-Naye, Stoos, and Klewenalp.
Kind regards,
Roland