For my daughter's taxes, how do I answer whether my full-time student supported herself? She worked 3 jobs to pay for food and car, but I helped with rent.

[DavidD66]

If she paid for more than half of her support, she supported herself.  If you (and anyone else) paid for more than half of her support, then she did not support herself.  

[NCperson]

@vcontreras8122 if she did not pay the rent, it is unlikely she paid for over 50% of her  own financial support.   Assuming she is under 24, she would remain your dependent. 

if you really want to determine it, the worksheet on page 16 is the way to do it. 

https://www.irs.gov/pub/irs-pdf/p501.pdf