Thanks a lot for your replies !

Does it mean that if she (who has the status) gets the JGC, i will be able to get the priority baggage and lounge access even if i don't travel with her ?
I'm going to Europe next month (using the new Haneda route) and i will be flying by myself... the economy seat is not going to be really fun for 11 or 12 hours so anything that could make the trip less painful...