No........this couldn't be the effect of the baby laying on a nerve.
I presume that she has had a recent antenatal check of her urine and BP to exclude PET. I cannot think of any cause for her numbness, but i would check with her GP or Obstetrician.
She says her BP was fine at her appointment yesterday and the numbness is only occasionally, she also said she felt faint as she was hungry and I've to stop flapping :-/