Yes, based on the information that you stated, your daughter is required to file an income tax return.
A dependent whose gross income is only unearned income (Survivor benefits and Social Security are both considered unearned income) must file a return if the gross income is more than the amount listed in the following table.
Marital Status Amount
Single
Under 65 and not blind $1,050
Either 65 or older or blind $2,600
65 or older and blind $4,150
Married*
Under 65 and not blind $1,050
Either 65 or older or blind $2,300
65 or older and blind $3,550
*If a dependent's spouse itemizes deductions on a separate return, the dependent must file a return if the dependent has $5 or more of gross income (earned and/or unearned).
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