Going marketing talk

I brought Kyla to the supermarket and we were on the way home with a heavy trolley and my hand full of groceries. She offered to pull the trolley and I agreed. Our conversation during our walk back home from the carpark is:

Kyla: Mummy, I want to pull.
Me: Ok. Hold on like me and look in front. (she follows suit and trodded along)
Me: Kyla, walk on.. walk... walk faster. (I was carrying a very heavy bag and wanted her to walk faster)
Kyla: Mummy, see...I am WALKING (getting frustrated with me and spoke in a very resolute tone)
M: My hands are breaking (emphasising the need for her to walk briskly)
Kyla: Let me see your hand. (inspecting my hand and said) No mummy, your hand no break.

How to answer her back... she made me laugh all the way home...