She is in a pit of hell because she is controlled by an evil person and has not yet been rescued. Over 18 months ago, the parents filed papers to challenge Michael's guardianship on the basis that his actions demonstrate, at the very least, clear and material conflicts of interest with regard to Terri's care (and very likely demonstrable malfeasance as well). The various other emergency measures that have been sought have been to try to prevent Michael Schiavo from rendering the guardianship issue moot by killing his wife first.
I don't think any of us can say with certainty that Terri would recover to some degree if normal function if removed from Michael's control. In fact, most of us here probably think that's unlikely. Numerous affidavits suggest strongly, however, that Michael has not only failed to do anything that might promote Terri's recovery, but he's also worked hard to prevent it. His actions clearly suggest that he does not want Terri's condition to improve.
To be sure, affidavits are generally not admissible into evidence in and of themselves. That's what depositions and trials are for. Unfortunately, Michael has actively worked to prevent any depositions which would but certain facts admissibly into the record.
I don't know that Terri's life would necessarily be pleasant even were she given the best of care. I do know, however, that the only reason her existence is as miserable as it is, is that Michael Schiavo has tried to make it that way.