Being under 19 just makes her a dependent on your return no matter how much she makes. You can still claim her. Did she get a W2? Or a 1099Misc? If she only got a W2 for less than 6,300 she doesn't have to file except to get back any withholding taken out. If it is over 6,300 or a 1099Misc for any amount she does have to file her own return.
Be sure on her return she checks the box that says she can be claimed on someone else's return. That is very important.
Online is only good for 1 return. But you can use the same email address for 5 accounts. How to start another return in the Online version
https://ttlc.intuit.com/replies/3288574
