She will be fine!
It's definitely harder on US than them. Jackson was 4 months old when I left him for 4 nights in February. He stayed with my mom & stepdad and their dog. I left a full page instruction on what to do w/ him, lol. My mom thought I was nuts. I called twice a day to check in. He did totally fine! He was very excited to see me!
I left him again at the age of 6 months to go to South Carolina for 4 nights and again, he did wonderful!
Also, I think they will always remember you... I watched a special (think it was Dog Whisperer) about the Hurricane Katrina dogs and they found this one dogs owner after months and months of being apart and the dog was SO excited to see the owner!