Has she even looked at Social Security's medium and long term finances? If anyone other than the government ran a program like that they would be accused of running a pyramid game and be tossed in jail for fraud.
I've topped out my 401k for the year, but starting with my January paycheck I'm thinking of cutting contributions to zero, pay the tax up front and invest in tax advantaged mutual funds which try to force as much of the return to be long term capital gains rather than dividends or short term gains. Depending on future tax rates it might even be better just to pay the tax now than pay the much larger tax on the principle in the future like a 401k.
Mark Levin asked her that very question on his radio show about two weeks ago. All she had to say is, that Social Security is backed with the full faith and credit of the United States. Comforting, no?