Supervisor Wrote Me Up For " Not Waiting For More Information" While Making A Mandated Report

Hello Reddit,

Location: Maine

I need some help. So, I live in Maine and work at a public school there, in a special education classroom. About a month ago, I had a student come in with a bruise on his face. I immediately called for a supervisor, as I know that admin wants to be informed of these things. No one answered so I then called for a nurse to look at the bruise. I waited from 8:30 to 11:30 before going to the administration office and talked to them. They said "we want to get all the context, so I'll have the nurse call mom and send me the information. Let's wait to call until I have that and I'll get you all the demographic information they will ask for." I went on my lunch break and then returned to the admin office, where I didn't find anybody. I went into the office room I was told I could make the call in and phone a sticky note with the phone number I needed to call. I then called the number and began speaking with a person from DHHS. In the middle of this conversation, the admin came in and said "I really wish you would have waited. Im still gathering information and I got more context from mom." I finished talking with DHHS and then my admin spoke with them, giving them the demographics. Then, my admin called me into about 2-3 separate conversations about "needing to wait" and "getting all the context." During the final conversation, the admin had re-written my written report, adding the "context" that "mom gave him a bath and didn't see any bruising."

Now, today, I was pulled into the office again, and given a written warning for "insubordination to follow the reasonable requests of a supervisor." I feel like this isn't legal or correct. From what I have read, the report, or at least the phone call, should happen immediately. I know fighting a written report is probably not worth the effort but I just feel like something is off. Can someone help me know what, if anything, I can do or should do?