I see it as ALS having already taken her life… she was done, this was just ending it on her own terms instead of letting a (currently) inevitable suffering continue.
With that said, we do need to be careful about assisted suicide. It should be when there’s no hope of a recovery in the time that you’re expected to live. In a case like Betsy’s, yes. Someone who just doesn’t like the thought that it may be another 1–2 years before there’s a treatment, or doesn’t want to create a financial burden by staying alive? That’s not so likely.