Multiple State taxe Returns OH and IL

Did you claim your daughter as a dependent?   Living away at school is considered to be a "temporary absence" from home, so you can say that she lived at home with you in IL, even if she attended school in OH.   Since she worked and earned income in OH, she should have prepared a NON-resident OH tax return and then after that, a resident IL return.   Is that how you/she did things?

Review your daughter's personal answers on the Personal Info section which is needed to help ensure that you create the correct state tax returns. Also, delete the state returns and start over.  You shouldn't ‌be paying taxes on the same income in both Ohio and IL. 

To delete your OH and IL tax returns, follow the steps below:

1. Launch TurboTax and select State from the menu and Continue
2. On Status of your state returns screen select delete next to OH and IL and confirm.

Refer to the TurboTax article How do I delete my state return in TurboTax Online?

To review your answers in the Personal Info section:

1. Select your name under My Info
2. Select Continue 
3. Select the down arrow under Other state Income and select Revisit
4. Select Yes, I made money in states other than IL
5. Select that you made money in OH.

After you complete your federal tax return and you move to the State Taxes sections, both your non-resident Ohio and resident state returns will be listed.  Prepare your non-resident  tax return first. Your daughter should y get a credit on her IL tax return for the taxes on the OH return.

For additional information, refer to the TurboTax Help articles Do I have to file tax returns in more than one state?,  Why would I have to file a nonresident state return? and How do I file a nonresident state return?