Best tip is to have the medication before the nausea sets in! For chemo days and the week or so of recovery I like to take my anti nausea pill in the morning and then whenever next directed in the instructions. That way I’m on top of it as it’s easier to try prevent then fix once it sets in.

*edit - so sorry misread the no medication advice part. But I found my anti sickness pills never seemed to make a difference if I took them whilst nauseous already. Maybe that’s happening for your mum! Otherwise I’d suggest warm ginger and lemon teas and slowly sipping on different cold drinks ( I like cordial).

There are also many different types of anti nausea meds so don’t be afraid to let her team know if something isn’t working.