I was gone for almost 10 days with a 10 month old. I pumped and froze quite a bit of milk before I left, but it was only enough for morning and evening feedings.
I pumped while I was gone and ended up pretty low at the end, but let myself go a long time (9 hour flight from Paris, wasn't hard) to be full when I returned.
The first night she didn't want anything to do with me and preferred a bottle from Grandma, so I pumped again.
The next morning I got her out of bed and tried to nurse again, she latched and we continued to nurse for 3 more months.
I would say persistence is the key. If she refused me again, I was willing to try for a few days.
I don't doubt that you can do it. Good luck and enjoy your break for a few days!
PS do not pack your pump in your luggage, carry it on, trust me, the last thing you want is lost luggage and a lost pump, even for less than 24 hours...