Yes, that could be the problem.
Check her return to see if the "Someone can claim you as a dependent" is checked.
Assuming you are eligible to claim her as a dependent, It should be checked (on her return).
If it is not checked, and you want to claim her, then she will need to amend her return with that change.
In turbotax, that box is changed under "Personal Info" > "You and your family"
On the line for dependents, click the "Edit" button and
Check the box indicating she can be claimed as a dependent on someone else's return.
To check her return, form 1040 in turbotax
Click the "Forms" icon in the blue bar at the top right of your screen.
From the list of forms, click the form you want to review (Form 1040, in this case)
Review as many forms as needed.
Hint: You can also review your state(s) forms here.
To return to the step-by-step process, click the "step-by-step" which is in the blue bar at the top right of your screen, where the "Forms" icon formerly was located.
The rules regarding who is a dependent are available
https://www.irs.gov/publications/p501#en_US_2021_publink[phone number removed]
At this site, on the left, click "Table 5. Overview of the Rules for Claiming a Dependent"
This explains whether or not you can claim them as a dependent.
I suggest you refer to https://www.irs.gov/publications/p501#en_US_2021_publink[phone number removed]
which explains rules for claiming a dependent.
Click on the blue "Dependent" link on the left side of the screen.
I hope this helps.
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