Prank call suggestion #1: The Taylor Swift Challenge. . .

Punk your best friend by calling her up and launching into the dialogue from Taylor Swift's "We Are Never Ever Getting Back Together."

YOU
Uggh. So he calls me up and he's like. . .
(in a dumb guy's voice)
I still love you.
(back to your voice)
And I'm like... I just... I mean this is exhausting, you know, like...
We are never getting back together.  
(with emphasis)
Like, ever.

See if she gets it or begins to commiserate with you. If her response is the latter, go with it, inwardly enjoying the hilarity.

 Here's your tutorial: