Slute was pretty much used up and burnt out by Torino. You could see that at the GP final, when she doubled the 3F in the SP and lost to Mao Asada.
She went on to make the same mistake in the FS at Torino, as well as falling on the 3L. Irina had had her skate of a lifetime a year earlier, at Moscow Worlds. She just could not sustain that high for another year, being chronically ill as she is.
I don't think Irina will come back to eligible skating. I think she will be able to make a comfortable living skating in shows in Russia, and maybe do the COI tour if she needs the extra money.