I agree with Sparrow that the victims' family should have a say. Personally, I see both sides, but I guess that I lean towards letting her die at home. Her evil deeds will never be undone; no amount of prison time will make up for them. It's not that I think she deserves forgiveness for her acts--I just think that sometimes in some cases there is room for a small amount of compassion.
I know she didn't have mercy for her victims, but it's important to me that we as a society are willing to show more mercy and compassion than criminals are capable of, when it is wise to do so of course. Since she is so ill that she cannot hurt anyone, and since she seems to have reformed to an extent, this might be an instance where compassion is appropriate. It's not because criminals deserve it, but rather because we as a society possess greater wisdom and are better than criminals. Sometimes it is better to err on the side of compassion rather than punishment and I think this may apply here.
That said, if the victims' families want her to stay in prison, I would support that 100%.