I can't wrap my head around Carter going off-world for anything except the a mission where she physically has to be there, ala Weir going on her last off-world mission, and that was a rare, in fact singular event.
There's no way she should have been on that mission to rescue Ronon. What's the purpose, what function did Carter serve there that some other soldier couldn't have performed? If the rescue team had been captured, who would have been in charge, Zalenka?
I think it's fine that Sam would give help in finding solutions, but I think she would be doing it from Atlantis. I know the TPTB want to give Carter a bigger role than Weir had, but it has to remain in the realm of reason.