Why is my ex talking like a completely different person?

Anonymous
We wanted to get married. The family on both sides is really fucked up. And together they fucked up everything. Family-to-family communication ended with her dad cursing and acting like a complete asshole. We kept talking in secret for months afterward.

Abruptly one day she just broke up with me over text. Said she just didn't love me anymore, wanted to end everything here, and blocked me on WhatsApp (our primary mode of contact). I haven't stalked or contacted her since, until recently.

After 2.5 months texted her just to say goodbye. Was literally expecting 0 replies. She is replying. Even carrying the conversation. But her texts have a slight vibe of mockery in them. She has always been the type of person to completely avoid communication when she doesn't want to communicate with someone. And although she does play the 'he should approach me first' card often. She never carries conversations just to mock. And it's not like I did anything to piss her off ever. And her speech pattern is completely like a different person.

Is this a thing? Is her brother, who is compliant with her family's madness, fucking with me?

I am answering her small talk questions with simple one-sentence honest answers. And as someone who literally had to say goodbye for myself more than anything, and expected 0 replies. I literally do not know what to think right now.
Updates
+1 y
Update. It is her. And she is not mocking. Although she does sound different. And I had overanalyzed. I have no idea where this is heading. I am kind of afraid. And I still have no expectations of getting back together.
Why is my ex talking like a completely different person?
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