Is it possible that your daughter claimed a GST/HST rebate on the 2014 tax return? If so, that is required to be reported as other employment income at line 104 of the 2015 tax return. If TurboTax was used for 2014 then this would carryforward to 2015.
Potentially another possibility is a taxable benefit being reported on one of the T slips. One possibility is an amount showing in box 118 or 119 of a T4A.
