I think the problem is water. If frozen, the water in the body will expand and destroy the cells, preventing any chance to bring anyone back. That would mean some sort of dehydrating process postmortem. This process would have to be fast enough to also dehydrate any and all bacteria completely and thoroughly within a very few minutes (not hours), otherwise the surviving bacteria would begin to decompose the body, replicate, multiply and make viable reserection impossible. Unfortunately, the technology to accomplish this simply isn't advanced enough yet to even attempt such a thing. And, honestly, I'm not sure we ever will get there without breaking the laws of physics. Or without understanding them far beter than we do currently. And then there's the massive amount of cancer she currently has that will have to be dealt with before she is revived, and, also unfortunately, most cancer treatments and procedures have to be based on how the patient responds to the treatments to find the best course of treatment, so she'd have to be revived first... But the cancer would kill her again before any treatments could be determined to be working or effective in any way. It's a real Catch 22 situation.