The best thing about this situation is that you all are in California and she's in Amsterdam.
You can *choose* whether or not to hate your MIL. Even if she's awful from now on, you can choose to love her - to care what happens to her, to wish her well-being, to help her if it's ever (?) possible. You may have to do it unilaterally, but you won't be the first to have to do that, and you won't be the last.
As far as her e-mails to your husband are concerned, you can tell your husband what you wish, but you can't tell him what to do or say. I imagine that he is very torn right now. This is his mother. He'll have to decide, but it may take a while. He doesn't like what's going on, either.
Meanwhile... don't turn into a shrew about it. Be as *unlike* your MIL as possible in the way you handle this. Let him see you expressing your feelings but taking all calmly or even humorously, letting MIL's problems be *her* problems.
It could be that the other family members are getting fed up with it, too, but they may be keeping quiet. Of all the undeclared wars in history, wars within families are the hardest.