I am sorry to hear that she is feeling miserable and hopefully she can make it through these times and come out stronger.
I took a SSRI (Prozac) for about eight months (40mg a day) and one day just quit... cold turkey so to speak. This happened many years ago but I really can't remember having any "after effects" associated with just stopping. Maybe it's the way that the drug is depleted from the body that might make a difference on how a person reacts to not getting it anymore. Of course, each SSRI has it's own way of "interacting" with a person's brain and ridding itself from the body, so each person's experience is different.
Have you had her visit her doctor and see if they can get her onto a "different" SSRI that might help with the withdrawls she is having? I have read that some SSRI's can "get along" with each other, but it's when SSRI's are mixed with MAOI's OR tricyclic antidepressants that there can be a BIG PROBLEM!
There may possibly be other drugs that can help with the anxiety she is having. I would HATE to say it since you are replacing "one evil for another" but how about a low dose of Xanax or Ativan for a short time? These drugs have helped many but as usual, there are multiple risks involved (let alone addiction) with taking Benzo's.
OF course, I am not a doctor and have no medical training whatsoever but from reading these and other forums, I am "pretty positive" that there is "mutual understanding" that can be had between her "withdrawls/anxiety" and her wanting to live life to it's fullest.
Good luck and keep us informed.