She can sponsor you while visiting in the US with you, yes. Alternatively, as a visa-exempt person, you can visit with her during the process. "Outland" refers to where your application is processed, not where you are physically. Buffalo's standard timeline is 11 months, but if you look at the Buffalo, Outland thread, you will see where many persons are being processed and approved in 4-6 months, and normally visa-exempt persons are admitted to Canada for up to 6 months at a time.
Income requirements are waived for spousal sponsorships, but if there is a question about how you will be supported, the IO could choose to interview you and ask how you plan to support yourselves without resorting to welfare.
If she "moves" to the US, part of the sponsorship process will involve her proving that she plans to return to Canada when you are given PR, so she will need to show proof that she has maintained ties with Canada, has plans for a home, work, education, etc. And they must be concrete plans, not just a vague statement of intent.
Check out the Buffalo thread for more information and assistance
