I told her not to move and dashed for the camera. Then we talked about what she wanted to sell (ice cream) and who she wanted to sell it to (people from Germany [I was traveling there frequently at the time]).
I work from home when not traveling and we still talk about customers, partners and even some of the challenges that come up and what we're doing about them. Not sure exactly how it will manifest when she is an adult, but I am certain some good will come of the exposure.
You are absolutely right, don't discard those moments.