I have this variant, and am undergoing treatment for a recurrence right now. Your Mother will be okay! Maybe the cancer will return, maybe not. You don't know when or where so there is nothing gained by worrying. Traditional treatments work very well and as long as your Mum keeps up with checkups and continues to follow her doctor's advice she will be with you a long time. What stage is she? What grade is the tumor? These are more significant factors than the pleomorphic type.
As long as your team treats the cancer aggressively and your Mum has a healthy lifestyle there is no reason to think she is doomed. Best of luck to both of you during this emotionally confusing time.
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