If they receive your email that you guys are no longer together, Embassy wont cancel her interview rightaway or what , they will let her in and do her interview, and they will ask her if you guys are still together and still talking and if she lies and say yes while they know the truth they will handle her a denial with 221g. And keep her passport in order to see if you guys can still work it out or give it to her back , but if its a withdrawal they will but my fiancé didn't brought about withdrawal. It was only canceling but they kept me under administrative for a time
But it's very stressful and heartbreaking