Chances are that no matter when you introduce her to the ktichen, that you’ll have what looks like cocoa puff cereal lying around at least for a few days
It will be new territory to her so chances are that she’ll want to poop a few times here and there. That being said, with her living in the areas directly by the kitchen, it may already smell enough like her that it may not matter. And if her poops are just “too lazy to go to the litter tray” poops and not territorial ones, you’ll end up with them anyway.
The other option is to wait until she’s spayed (that’s assuming you plan on doing so) because spaying reduces territorial pooping so she may not poop in there then. The other thing to mention is that not all bunnies are 100% with poops all the time anyway. You can get most to 95% but it’s only the rare bunny that will be 100% with poops all the time, which is only fair given the number that they produce.
Also keep in mind that she probably hasn’t had hormones kick in yet for her teenager phase, once they start to develop she may lose some of her litter habits (because hormonal intact rabbits are more inclined to mark territory) so she may at this point get worse before she gets better (not certain, some are fine).
Basically, to sum all that up. There’s so many variables that it’s impossible to know what she’ll do, but I’d say more likely than not she will end up pooping in the kitchen at some point. If you’re concerned about it, wait until after she starts to mature and you have her spayed. Much easier to train that way than to prevent an already occurring poop fest!