Can a daughter who pays her parent's mortgage and property taxes claim the deductions on Sch A?

No, a daughter who pays her parent's mortgage and property taxes generally cannot claim those deductions on Schedule A. To claim mortgage interest and property tax deductions, the taxpayer must be the owner of the property or have a legal obligation to pay the mortgage. Since the daughter does not own the property, she is not eligible to claim these deductions, even if she is making the payments.