@Frank-Malczewski For anyone reading this post, we solved the problem.
Before I followed the instructions above for sharing my computer with my wife (creating a triggercmd account for her and sharing my computer), I had tried to add her to MY triggercmd account by going on HER phone to HOME / SETUP DEVICE / WORKS WITH GOOGLE and linked to TriggerCMD Smart Home, which it accepted. But after following Russ' process for sharing the computer, neither of us could use Google to turn stuff on or off.
What I had to do is DISCONNECT TriggerCMD Smart Home on HER phone, then reconnect it so it picked up her new triggercmd.com account. You cannot have two people trying to access the same account.
Problem solved and now we both can talk to Google to turn lights on and off.
Thanks Russ for working with me on this...
EDIT: I see that Russ also posted that we solved this! We must have been typing at the same time...