The assault could be one thing that prompted an investigation, questioning of the child's teachers and so on, and then those people remembered noticing bruising in the past. I suggest the bruising is not contemporaneous with the assault. The assault might not have been physical since the charge is common assault. (However I suspect the assault was physical or had a physical element because police aren't easily motivated.)but wasnt she initially removed from them because of bruising from an alleged assault?
The stalking/intimidation charge is more serious--potentially higher penalty.