We had a very similar experience when we went overseas with DS. It took us a good 6 weeks or so to get back to where we were before we left. If you think about it though, when we go away we turn everything they've every know upside down. Even though we're still there with them, everything else is different. Who can really blame them for being unsettled and insecure when they go through such a big upheaval? And even though you're home now, she now knows that that could happen again at any time... I think all you can do is comfort her as much as you can and make sure she knows that you will always be there for her... With a little bit of time things will go back to normal.