I'd say let her decide. Let her try both in a safe area and explain the differences, and the advantages and disadvantages. If you learn to ride on these you will be so much better at it in the long run, but if you don't like them and you want to wait thats ok too. Those ones are much easier. 8 year olds arn't completely inept to make their own decisions, I think she could give both a shot, and if she chooses clipless bring along a pair of platforms and a tool just in case... you could even show her how you put them on and take them off... How cute!!!!