I took my twin daughters camping when they were 6 weeks old. LOL, I know, I'm a nut. They just slept in their little car seats/carriers at night. It worked fine, no bed needed.
If she is bottlefeeding, I have to say that that part was a huge p.i.t.a.!! Gotta have bottled water, some kind of travel bottle warmer, and some way of washing all those bottles or they will get nasty in the heat. Plus some kind of cooler to keep mixed formula from going bad.
Besides that, just regular stuff like clothes, diapers, wipes, couple light blankets, and something warm in case it gets cold at night.