The UTMA account for your granddaughter should be in her name because she is the owner and if her investment income exceeds $1,300, it needs to be reported on her return.
For additional information, please review the TurboTax articles Tax Filing Requirements for Children
I'm not clear what you are trying to do. Are you filing a return for your granddaughter? Are you filing your return. Please provide more information so we may help you.
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