I got my daughter her own bike, but shes not past the training wheels can't ride faster than I can run stage so taking her to the park thats 6km away is difficult. I don't have a car so I used to take her in a kid basket on the back of my mtb. Sadly we managed to kill the chain through waaaayyy too much weight and an uneven surface at 20km/h.
That was the day the world told me that we couldn't ride in that configuration anymore without destroying the rims (did that about 4 months earlier.. same thing trip to the park), or killing Dads legs. 22kg of kid make for hard work.
She will eventually learn to ride on her own, but for now I see a few options.
1) Get a tandom. This might be difficult when I'm at least twice her height and I can't see a tandom being that adjustable
2) Get a 'trail a bike'. The dude at the LHS seems dead set against them. Calls them dangerous
3) Get a trailer. I think shes already too big for this option.
What worked best for others in the same situation? I really enjoy riding with my kid and so does she.