Well what happens is they will put a warrant out for you.
If you are stopped you will be held, and they will ask the jurisdiction that has the warrant if they are willling to pay the cost of having your brought back.
So it all depends, if they are mad enough, if they believe your sister is at risk for your refusal to follow the courts orders, yes very likely they will.
It all just depends on how bad the agency that is against you, wants you back.
In the end, you really will not know if they will or won't, until you are caught down there. And if they don't the first time, they can still do it any time they catch you again, and again, and detain you each time while they check