i would imagine if it were me, i imagine my anger would be so great, if i went id be wanting to hurry her demise!
under those circumstances, i would not go...i would want her to die knowing what i thought of her and a rotten person she is
if this was 5 years ago and she was fine, would you go?
unlikely.
and i also doubt people on here would be advising you to go either... just because she is dying does not mean all her horrifying behaviour goes away.
some things are unforgiveable, even in death...
lets face it, you dont want to go, and going would probably upset you - and no doubt her - because she wouldnt exactly get a warm response...you may even end up rowing...
if it has taken her this long to make an effort, its clearly more to do with her imminent death, and perhaps some misguided attempt to make ensure she goes to heaven - a sort of deathbed confession (if she believes that sort of thing) than coming from a genuine feeling of regret and a true desire to make things right - or she'd have done it sooner - so her words and responses would probably not be quite as remorse-filled as you would like and that would anger you even miore....especially if she tried to somehow justify herself....
so i would advise you perhaps write her a letter... tell her what you think - dont rant and rave but just put it straight that you dont want to see her and why etc... at least then you will know you had said your piece...you could invite her to write a letter back - you dont even have to read it if you dont want... but she will also feel she has said her piece...