I ended up looking up some guides for Tamagotchi for Game Boy because the manual and in-game help were super vague. Based on ANNIE's stats, I think I was already doing okay!
Unfortunately, Mine (Selfishness) went up by 1 while I was saving this screenshot. Oops. I'll do better.
It's been a few months, but I wanted to check up on ANNIE the Used Game Boy Tamagotchi, who was sleeping right where I left her.
I know this version lets you speed up time to wake them up, but I couldn't bring myself to disturb her sleep, so I ended up turning the game back off.