K.D.
She won't reject you when you return! Pump 3 times a day, and every time you go to the bathroom express a little into the sink, while in the shower express some milk then too. Wear breast pads, because even if you didn't need them before, you will while you are on your trip! (Also keep fresh ones in your purse for quick changes when you have a chance)
I went back to work on weekends when my daughter was exactly that age. Let me tell ya, by the 6 hour mark I was so full! When you get back, it may take a day or so to get things back 100% full swing, but you won't be rejected by her or be dried up at all, just maybe a little less milk than usual. By day 3 of your return you will be totally normal again. Good luck, and don't stress! All will be fine :)