Nice get!
Thanks for the link. The language is confusing but it is not claiming that Terri will go to hell if someone kills her.
Please read further on. The brief explains that as a Catholic Terri would not make the decision to end her life because of the Church teachings condemning Euthanasia and suicide. It says that for her to advocate her own killing by the withholding of food and water would be a sin of the gravest proportions. It is not saying that Terri soul is in danger of hell if this is done to her. It is saying that Terri would not have made this choice because such a choice voluntarily made would endanger her immortal soul.
http://www.miami.edu/ethics2/schiavo/Filed_07-19-2004_ReliefFromJudgment.pdf
Good grief! They actually put that in the filing. Completely inaccurate, and so sad.