Why on earth have you filed a C100 ? A C100 is an application for contact or residency ! Who are you asking to have contact with??? You already LIVE with your children.
It seems clear you don't have a clue what is going on..
As for "From this point onwards I believe my children are at risk of emotional abuse so there will be no orders"
That is just wishful thinking and has absolutely no logic to it.
The system works like this.
Anyone can ask for permission of the court to apply for contact for a child. It can literally be your next door neighbour. ..
The child's guardian and the applicant go to court. The applicant explains why they believe they should be able to apply. .. (in this case , the grandmother has contact with one gc but not the other, she will say that it is not fair or in the interests of the child for her sister to know GM but not the other sibling. That she has had contact for sometime and presents no welfare threat. That in the child's best interest, she should be able to develop a relationship with the GM.... all very plausible.
Then YOU tell the court why this is a terrible idea. Your history with her. Police involvement etc.. your fears of emotions abuse.
Then a decision is made. Only YOU didn't bother turning up. So there is a VERY high chance she was allowed to apply. The application for leave would only have been granted 4 weeks ago, at the very earliest. I don't think they have to notify you at this stage.
However if she DID succeed expect a C100 completed by her to be heading your way very soon.
This is the reality. Do you really want to live with that very serious possibility hanging over your head. If she is a game player than she may not even apply straight away... may wait , just to cause you extra anxiety.
The ONLY way to remove her power from her is to get your act together and KNOW where you stand. Take away any possibilities for her to spring a 'surprise' on you when you least expect it.