Well, it's good that she logs in on a daily basis, right?
I'll do my best to make her play every day as well...
Don't ignore the login bonuses.
There are two types of bonuses, the consecutive daily login bonus that resets every 7 days, and a cumulative login bonus that counts the total number of days you've logged in.
If you log in daily, you'll get enough items to perform a rare summon twice every week.
Rolling for Heroic Spirits and Craft Essences every week may sound nice, but saving them all up for events is even better.
She seems to prefer spending everything right away though...