IMO, To cut to the chase: what your intentions were as regards charging is not the issue, by your own admission you parked, did not charge and left your vehicle. On this basis the contravention is proved.
Your intention goes to mitigation.
However, pl elaborate on 'Walked around the corner to drop off my daughter..'.
Why, how old is she, is she independently mobile etc? We need to look at the issue of what's know as assisted alighting.