Ella said:
If she put all this in text or email, your lawyer is going to love it.
Yep, all in text messages.
Stop dropping off things at her house. She’ll just use it against you. If the kid forgets something, either take it to the school office or wait until he’s back with you.
Block her. Your husband should only communicate via email or a court-monitored app.
Right now, there’s nothing to do except document everything and let your lawyer handle it. DO NOT sign anything she gives you.
Save every message. If your state allows it, record phone calls. Some people even install cameras to have proof of what really happens.