ExW has contacted police after drop off allegation

my son is fairly abled although suffers from arthritis. He has down syndrome but isn''t very severe, he''s quite mild. She told the police he has a mental age of 5, obviously to make it sound more of a big deal but i would say his mental age is somewhere between 10 and 12.
He goes to the bus stop on his own to get the minibus to school and i sometimes leave him on his own if i have to nip down to the shop. He will never be a danger to himself.
What annoys me is the fact that she said she wasn''t in and i know she was as her car was in the drive and the door was unlocked cos my son walked straight in. We have had no major problems with him in 3 and a half years of the SRO and low and behold 6 days before the court hearing this supposedly happens. She has never fully accepted the SRO as her mindset has always been that she is the mum so the kids should be with her. I have a brilliant relationship with both of the boys and i think she is jealous of the relationship that i have with them. Two months ago my youngest told me that he wanted to go to his football coaching more, as he wants to take it more seriously and wanted me to take him as he felt that he could progress more quickly with me there helping him. He also said that he was happy to stay at mine for these two extra nights per fortnight as the training finished late. This resulted in him being at mine for 8 nights per 14 and his mum 6 nights per 14. His brother''s schedule would remain the same at 6/14 with me and 8/14 with his mum. My ex cannot accept the fact that the youngest would be with me more than her so she has started court proceedings to enforce the SRO which was made when the boys were 9 and 10. The youngest one has been feeling somewhat restricted and frustrated of late as she constantly reverts to the court order when he wishes to do something involving me outside of the scope of the SRO. She says things like "you have to come home as we have a court order in place that is there to protect us!!!" He isnt in any danger as he is with me but since separation 4 and a half years ago she has been making allegations and accusations of me in court hearings and statements such as i am controlling, bullying, intimidating, she''s afraid for her future wellbeing, the kids have been brainwashed and manipulated etc. All i am trying to do is to listen to my children and try to introduce i little flexibility in to their lives as they get older in order for them to become more independent. She on the other hand would like to rigidly stick to the SRO until they both turn 18. After nearly 5 years you would have thought that she would have chilled out a bit but she''s even more calculating and manipulating now than she ever was. I''m really worried that her behaviour could impact negatively on both the boys. The accusations are still the same in her new court statement as well as the youngest is angry and dismissive of her and exhausted etc but when he is with me there are no problems at all. They both are perfect. I have written to both schools asking if they have noticed a change in either boys over the past couple of months and they have replied stating that they have absolutely no concerns whatsoever. So they are fine with me, fine at school but with her they have all these problems????? Whats the common denominator??