My wife's visa has been approved for her CR1 visa. However, she needs to return back to her country after a month in the US. She will come back to the US after a couple of months later, but I'm worried that US immigration or the airline will give her issues because of a return ticket back to her country. If I understood, once she enters the US, she needs to stay in the US and needs permission from US immigration to leave the country because here visa can be revoked. Is this a concern that my wife and I should be careful about?