Where does it say not sent? At Turbo Tax or the IRS? The IRS is taking a long time (like months) to show up on Where's my refund.
Did you use the software program on your computer? For the Desktop program you have to check the filing status inside the program. Open your return and go up to menu item
File > Electronic Filing > Check Electronic Filing Status
When you efile you get back 2 emails. The first email only confirms the transmission. The second email says if the IRS (or state) Accepted or Rejected your efile. Check your spam folder.
