Why is SSA-1099 box 5 blocked?

[southall]

My daughter's w-2 is under $8,500 and has SSA disability income of about $12,000.  The place in TurboTax to enter the SSA amount is darkened with a zero and won't allow an entry.  It may not change her tax liability, but, doesn't the IRS want to know this income since she is receiving an EIC credit?  Why is it blocked?

[Anita01]

No, it's not part of her Adjusted Gross Income or Taxable Income.