If she has SP, there is indeed zero problems, but OP mentioned that she is SM and her husband does not have status, that makes it more complicated to go through security in departure hall 3 where a person inspects the boarding pass before allowing to go through priority security toegether. There was a whole discussion about whether silver members have access last year on the klm forum (see for example the confusing sign in the first post where skyteam elites have access, but only Delta GM and higher with no mention of Delta silver), while guests were, at least last year, not allowed. Going through the departures 2 SP area there is no in person check, only to access the checkin area where ST elites and guests can also go, so a safer bet in my opinion. Glad to hear if things are different though and SM can use dept 3 as well with guests potentially, have always had this as my assumption but happy to be corrected on this if wrong.