Q. In the 6 tests to decide if a child is dependent or not, you didn't particularly list age as one of the tests though you did mention it in the text above that the age could limit dependency.
A. Earlier in this thread, the rules for a Qualifying Child (QC) were explained. To be a QC, the child must be under 24 and a Full Time Student. Since your daughter is already past 24 years, she cannot be a QC. We then look to see if she can be a dependent, under the 6 Qualifying Relative (QR) Rules (the 2nd set of rules above). Age is not a rule for QR dependents; nor is student status. All that matters now is her income and the amount of your financial support.
So, since she has no income and if your "helping her for school fee, boarding and lodging" is more than half her support, you still claim her as dependent and can claim the education 1098-T credit as well.
The support value of the home, provided by the parent, is the fair market rental value of the home plus utilities & other expenses divided by the number of occupants.
The IRS has a worksheet that can be used to help with the support calculation. See: http://apps.irs.gov/app/vita/content/globalmedia/teacher/worksheet_for_determining_support_4012.pdf
