Help with filling taxes for teenager with minimal income

Hello,

My 18 year-old daughter (who goes to college and lives with me) earned about $900 in income (W-2) and $800 in  bank interest (1099-INT) last year.

What's the best way to file my/her taxes?

a.  she files by herself?

b.  I include her income & interest in my tax return?

c.  she doesn't file taxes because her total income/interest is too low, and I don't include her income/interest in my tax return (because it's too low) but still include her as a dependent?

Thanks!