Glad it went so well! Welcome to America! My fiance travelled by himself to come here, POE Philadelphia and he also had a pleasant experience with friendly people. There are both good and bad experiences with POE, being prepared for a difficult interview makes the pleasant one that much more of a relief IMO
Like others have said, she is now a permanent resident in the US and can remain there at least until the expiration date on her green card, at which point she will have to apply for a 10 year and that will be on her. You have no right to make her leave the country, as USCIS has granted her permission to be here. You should treat it no differently than if you were married to a US citizen. You are her husband not her immigration officer. So what do you do when any marriage is not working out? You talk to the person. You get a divorce. You could not make that person leave your house, the state, country, or do anything else. Talk to her about the situation, and if she is not willing to leave than you would have to leave. Talk to a lawyer about it, see what you can do to remain in your house, if you want a divorce, get a divorce. That won't take away her right to be here. It will be up to her if she stays, if she applies in two years for removal of conditions, and up to immigration if they grant it.