Dla. Can anyone help with mandatory reconsideration?

Have you looked at the criteria for mobility part of DLA for your child? https://www.citizensadvice.org.uk/benefits/sick-or-disabled-people-and-carers/disability-living-allowance/before-you-claim-dla/claiming-dla/

There's no right or wrong way to word the questions, you just need to put a couple of real world examples of what happened the last time they attempted that activity. Adding information such as where they were, what exactly happened, did anyone see it and what the consequences were.