Lewis goes through phases of this. His trick is also a sore tummy and that he feels sick. Although he will actually try and make himself sick just for the attention.
I know his tummy has been playing up the past few days, but hes had no sickness so that's just attention seeking too. It's hard because like you say if you ignore her she has a tantrum, whereas with Lewis if you ignore him he will go on and on until he actually vomits! I tried just sitting him on my knee and trying to distract him with something else. It seems to be working, I doubt you would be able to do that if Ella is in the car and you are driving.