How can I make her believe me this time (she broke up and isn't speaking to me)?

I've pranked her many times in the past and one time I overdid it. I've pranked her about what many women don't ever want to be pranked about. That one nearly led to a break-up. She was very angry and hurt, even in tears.

It was for real this time but she didn't believe me, is upset, kept saying ''I told you not to ever prank about that again, it's over now'' and isn't speaking to me. She thinks it's a set-up and that I'm joking again.

The one single time I'm not joking and it's genuine... she doesn't believe me. I tried going after her but she left in her car and told me to fuck off. I meant it all. Any way to make her believe me?
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My friend and cousin has been trying to tell her it's not a joke but she still believes they're part of the set-up. I know I've pranked her about that one in the past and she believed it... then I made her cry.

That was the past. It was for real this time. It's real and she doesn't believe it.
How can I make her believe me this time (she broke up and isn't speaking to me)?
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