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Maintenance support (alimony) will not considered earned income and will not affect social security disability income,
however, alimony is taxable income and depending on other taxable income may trigger that SSD income will be partly taxable.
The simple test - assuming she is single - if all annual taxable income plus 50% of SSD income is less than $25,000 - SSD income will not be taxable.
Please let me know if any clarification needed.