The investment sale will require a separate return for your daughter. You cannot include that transaction on your return.
For more information about when you can report your child's income on your return, see the following TurboTax article:
How do I report and pay the Kiddie Tax on my 2020 return?
I cannot provide any suggestions for a free service you could use, but if you used one of the CD/downloaded versions of TurboTax, you can use the software for your own return as well as your daughter's.
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