if yam cha, me ususally just order a bowl of "BBQ Pork Rice or Noddle" for her, after she is done with the rice, she look after my bb, so i can eat. in that case she wont eat our dim sum.
to be frank, uaually when yam cha, we have 4-5 ppl. each dim sum only have 4 pieces or some only 3 piece, if give one to helper, its not enough for the family. or we need to order everything in double...
not that i am selfish or being cheap, but i think this is best and fair way!! coz i bring her out for dining is to have her to take care my kid, not to enjoy the food when eatting out.