Tourist agencies in Indonesia are useless for that kind of thing, yet so many Indonesians use them. Boggles my mind. Basically those agencies either give general advice that is helpful for other visas like Schengen and Japan (such as letter of recommendation), or shady advice like the OP's partner received.
Anyway, she should just be honest. Putting you down may or may not hurt you, none of us know. Her age, occupation, etc are more relevant anyway. She should just be truthful, that way she will avoid any problems down the road.
And tourist visa applications have no bearing on K-1 applications. Good luck to you both!