You should be contacted by your ex prior to the medical care being provided unless it is on an emergency basis since you have joint legal custody which typically means you have equal authority to determine whether medical care is necessary.
At a minimum, she should be communicating with you that the children were seen by a medical professional and why.
Since she is not, it appears that she is intentionally attempting to undermine your parental rights.
Because of this, I would consider retaining a local attorney to draft a warning letter to her that a motion for order to show cause
will be filed if she continues this conduct since there is an obligation that the parents work together toward the best interests of the children, and she is not fulfilling this obligation.
The motion for OSC would normally request that the court hold your ex in contempt for violating the decree and her obligation under state law.
All the best to you.
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