If they are sanctioned, then you shouldn't be allowed to play Bloodbraid Elf at all. It is to stop decks going 2 for 1 and swamping out control deck.

Anyway, Experiment One , Kird Ape and Burning-Tree Emissary ?

Yea I think you're mistaken, Since its banning Bloodbraid Elf is no longer legal in the Modern format, no matter which deck you want to play it in.

You might have misunderstood Wizard's reasoning for the banning as permission to use it in Non-Jund decks.

They said: "We wanted a card that top players consistently played four copies of in Jund, but ideally was less played in other top Modern decks."

So Bloodbraid Elf was banned because only Jund used it, but you still can't put it in any deck and call it Modern legal. If you're friends are cool playing with it that's fine, but don't try taking this to FNM without swapping her out.