hey mate - enrolling in school without consultation - bad form. Not keeping you informed of medical stuff same deal - I'm assuming you have interim orders. Mate all of this stuff is gonna help you out in the long term.
Just keep good records and concise text messages - "dear ex, did little timmy see a doctor about his sore throat"
NO response? Sweet. solid proof of her refusing to communicate with you. But don't go mad trying to chase stuff down at medicare - those text message is sufficient to show she isn't working to co-parent with you...