I know her friend said it, but what matters is not whether Terri would have wanted a divorce under the circumstances that existed in 1990, but whether she would want one under the circumstances that exist in 2005.
If Terri had an honest guardian, none of this would be an issue since Florida law explicitly allows a guardian to file for divorce on behalf of an incapacitated ward. And it Terri had an honest judge, she wouldn't have her current dishonest guardian.
I see. It would seem the reasons for Terri desiring divorce would greatly have increased since 1990.