Since we can't see your return, we need a little more help to determine why the software isn't allowing your dependent this year.
Sometimes it is simply a question that has been answered incorrectly in the interview such as "Did Kathleen provide more than half of her own support?"
I suggest revisiting the section My Info (Personal Info in some versions) and reviewing these questions. You can also double-check if she is eligible outside of the software with this helpful IRS tool: Interactive Tax Assistant: Dependents.
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