Thanks Lorina and Linsaa fdc

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Me and daddy spoke to Rhona in afternoon and have told her to apologise to the friend and friends parents at Schoolgate, Rhona agreed to this and did apologise to us saying that "it was a heat of the moment rant because she didn't appreciate being shouted at by anyone that isn't her parents".
Me and daddy did stick to our word though so grounding still stands (which upset Rhona).
We have also told her what you suggested, its a fastened jacket or else no outside so, when she wanted out to swingpark we put that into practice but she challenged it, until she realised that we were serious, so after 5mins sulking, she eventually fastened the jacket and put her hood up but OH discovered that only velcro was fastened so he said "nice try but until zip is tied too, you stay inside", she immediately unvelcroed the jacket, tied the zip AND velcro and went out to park for 45mins.
We have also written out a reward chart for morning routine and if everything on the chart gets completed all week, then there will be a treat on Saturday (out for lunch).
The list is something like this:-
0800- Wake up, get washed, hair and teeth brushed and dressed for School.
0825- Be downstairs for Breakfast
0830- Pack Schoolbag for the day (pencils, books and lunchbox)
0835- Shoes on and tied (come to me if you need help), jacket on and zipped up fully, hood up and gloves on.
0840- Be outdoor and on way to School.
I will not punish her if she needs help tying her shoes or jacket or if she leaves jacket open on a nice pleasant day.