Okay, here's my honest response--
Dude, have you heard about Plan A and Plan B? If not, here it is. For a moment, forget about her immigration conundrum and also ask her to forget about it too. When she gets the visa, you think about it later. Just let her enroll into a 4-year program of her choice, be it nursing, computers, etc. Since you said there are two possibilities for her to come to the States-- within 2 years or 4-5 years. If she is enrolled in a 4-year program and gets the visa within that 2-year period that you're talking about, she migrates to the States and transfers her credits and resumes her education where she left off. If her immigration process takes her 4-5 years, still fine; she will have enough time to complete education (not just a general BSc or BBS, but a more specialized nursing, or engineering). That way she can have a sell-able degree when she comes to this country. How much sell-able will our Nepali degrees be here is another topic that we can discuss some other time. But at least, I feel it's better for her to study in a field of specialization and quality and also for you to put your money at the right place instead of trying to spend your time in a college in Nepal waiting for the immigration process.

And there goes my two cents.