"—and she can't get anyone else to do it (mow her lawn) for her."

                   Actually, she can't get anyone else to do it for what she is willing to pay. The guy who would have done it is drawing unemployment compensation, but if he tried to do it for what the illegal is doing it for, he would lose his unemployment and his family would be out in the street.

                   Meanwhile, the illegal is doing it for cash under the table, so nothing is being paid into the ailing social security system, unemployment system, workers comp. programs, Medicaid and etc. So the fact that he doesn't make enough to pay income taxes is irrelevant.

                   Ergo, the taxpayers are subsidising the mowing of the lady's lawn, and the illegal alien is sponging off the taxpayers himself without even realizing it.