There may be three separate issues --and
one is how long you can sit on a deed w/o recording it--I'm not sure why you sat on the ded all this time.
two, is when is a deed transfer effective in your state--upon delivery to new holder OR upon recording of same--that answer could be critical, see three. (Pray it applies to deed delivery and Mom delivered and dated deed back in 04.)
three, for purpoes of MEDICAID under prior law there was a 3 year lookback, but that changed in Feb 2004 to a 5 year lookback so it is critical as to exactly when her transfer took place--and turn summersaults to get it right before you fill out any forms for assistance!!!!
Ergo if the transfer was pre 2004 its only a 3 year lookback and the asset seems out of her estate.
But if its a recent, post Feb 2004, transfer you may well be stuck with a 5 year lookback --and that has draconian results if you trip over it.
And it could get more complex if Mom preserved a written life estate.
NOTE common sense doesn't always apply and a date as to creditors standing for recording may not be the critical date for change of ownership--its pretty darn state specific --and in my state I think both dates would apply for different purposes thus giving some latitude to picking only hte date I needed to disclose and cross my fingers. But above all don't give out "wrong" dates and try to patch it later---do your homework first.