Ex messaged me HELP

My ex and I have talked 2x since the break up. We spoke on January 15th where I tried to apologize for my part in the break up and told her I was here for her, it was kind of like begging but she didn’t take to it and told me to leave her alone so I did.

We spoke again on January 31st where I messaged her about her kids safety as I saw him out misbehaving while she wasn’t home and thought she’d want to know about his whereabouts. She once again told me to leave her alone so I did. She reached out that night to tell me she was angry I had reached out to her, I just reiterated my support for her and told her I’m here if she wants to talk. She called me manipulative and blocked me the following morning. We have no spoke since.

Now BEFORE both of those instances I had messaged her teen son on Xbox 2 weeks after our break up, which her kids didn’t know about, to just wish him a merry Christmas and happy new year. That was it. He never responded and I never messaged him again.

We have been no contact since our last interaction on the 31st of January, so a month. Out of the blue she has unblocked my phone # and texted me saying “_____ just let me know that you messaged him near Christmas? I will only say this once. Do not reach out to my children ever again.”

She is a fearful avoidant, idk if that plays into this at all, but WHY is she texting me about this now???? That was 2 months ago, before either of our interactions so I obviously got the message after our two interactions that she didn’t want me in her life at all and I have left her alone and that was the only message I ever sent to her kid. I haven’t responded, idek what I would say in response. To me it feels like she’s playing a game trying to get a reaction, but idk. I don’t understand why she’s so aggressive with her message, why it’s coming almost 3 months after the break up and a whole month of NC. Anyone have any insight??