Can Your Period Stop For Months Then Resume During Menopause?

I’m worried about someone I know. She’s in the pre-menopause stage and her period stopped for a few months, then resumed on her exact due date. Is this normal? She also drinks, can liver problems be a factor?

Is It Normal To Have Hot Flashes After Menopause?

I had my ovaries removed in June, and almost two months later I started having hot flashes, and I wake up at night sweating. I thought hot flashes only happen during menopause, not after.
And if this is the reason, how long does it normally last?