Based on my own experience, visa officers and border guards are cooperative if you are honest with them.
My Russian wife ( married only two months ago ), is in the USA on a student visa. We haven't yet submitted her perm. residence application. We are still waiting for her Russian police report. She just got back from Washington having successfuly got a visa to visit me during her spring break next week. All she needed to do was show that she planned to return to finish her studies, and that she had enough money. They have limited her visa to April 4th. I suspect that they are waiting to see whether or not I will be approved as a sponsor before they are prepared to give her a longer visa. She will consequently need to reapply in July for her next visit. Again we will be honest, "Visa officer, my wife has the option to remain in the USA to complete her optional practical training ( one year of employment relevant to her studies) , but we would prefer to be together." That's our plan. Be honest. Show that you understand the rules ( I specified this understanding in my letter of invitation ). Show that you want to follow the rules.