-As a couple, K1 and CR1 are the only options as far as im aware
- She cannot come into the US with the intention of adjusting status, that is fraud and you don't want to mess with that
- The processing times are similar, yes... CR1 has way more benefits
- She can travel to the US while the K1/CR1 is pending... but as always, she is at the discretion of CBP
- She can stay in the US for as long as CBP says she can (check I-94 or passport stamp)