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Yes, if she has been considered a dependent on your return up until this year and nothing else has changed, the fact that she is receiving SSI is not going to change that if she still is not providing over half of her own support. 

SSI is not taxable, so if she has no other income she does not need to file a tax return.

Yes, the rent will be counted as income on your tax return.  Since you are not likely charging a fair market value for the rent, you can only deduct rental expenses up to the amount of the rent.   To do that you will take the following steps:

  • Click Federal
  • Wages and Income
  • I'll Choose what I work on
  • Scroll down to Less Common Income
  • Click Start next to Miscellaneous Income
  • Scroll down and click start next to Other Reportable Income

[Edited 2/18/2020 @ 8:22AM PST]

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