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Please see here the complete definition of dependents - http://hrblock.com/taxes/tax_tips/deductions_credits/dependents_family.html?ttiptitle=Dependents
As your daughter doesn't work - she is likely also your dependent.
Please see the Worksheet for Determining Support in the IRS publication 501 - http://www.irs.gov/pub/irs-pdf/p501.pdf page 18.
Simply print this page, fill the worksheet and provide it to the IRS agent.
You also need provide information that your daughter doesn't required to file a tax return - if that is true - children are not qualified children for tax purposes for your daughter. So - your daughter should provide a statement that she does not require to file a tax return.
You might need someone - local CPA or Enroll Agent - to represent you - the IRS agent will act differently if you have a qualified representation.