There is nothing to report. Care standards are reported to Ofsted, but this is a contractual matter and Ofsted don’t regulate contracts.
Your childminder says she has to terminate on medical grounds, ie stress. Unless you have any solid evidence to the contrary, just accept she is telling the truth. So, she would like to continue working but is unable to and has a duty of care not to work for children whilst unable. That indicates she is a mature, responsible adult who doesn’t deserve to be traduced as you have done. It also means she has not "breached" the contract, but has terminated through a legally acceptable process called "frustration of intent."
You can call Ofsted if you wish to check whether she has been suspended following a complaint. It is exceptionally rare for them to suspend anyone without an unannounced inspection taking place first.
The council will not have received a complaint as its over a decade since local authorities had anything to do with the regulation of childcare.
Those are the facts, the following is merely my opinion. I doubt your childminder woke up one morning and decided it would be a jolly jape to stop earning a living just to stitch you up. Your childminder told you she had a medical condition and you instantly disbelieve her. That is callous. People who assume the rest of the world is lying are usually those who are themselves so used to being dishonest they expect dishonesty from everyone else. You don’t believe your childminder; you don’t trust your childminder; you think she is so bad that she’s attracted a complaint so serious that she’s been forced to close... and yet that is whom you leave to care for your child. Says a lot.
i think your childminder has stress, and I don’t think we need look too far to find the cause.....