It sounds correct. There is likely no withholding on her social security, and that is probably why she owes. If she only had her social security income, none of it would be taxable, but since she is still working, more of her social security is being taxed. If she is still working, she should submit a new W-4 to her employer and have more tax withheld, so this does not happen again.
How is social security taxed?
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