can you have a cold sugary drink, that usually gets them going. I think your mum is just worried and being a caring mum, but /i think she also needs to calm down a bit.
You were in being monitered today and she was fine. Has she been quiet all day?
Maybe just call the MW and tell them your mum's concerns. At least then you can say "yes mum I called them, they said it's normal". If that would help?

What does your gut instinct say?