Ditto those who say to leave on something for white noise. When we leave our dogs in the RV we leave the TV on and set the AC/furnace fan to "on" so that it runs all the time.
We also reserve a special treat for when they're crated in the RV. For our dogs that's a Kong toy that's stuffed with chunks or shreds of cooked chicken and held together with canned cheese and frozen. It takes them a long time to get through that. By the time they do we're long gone and they're ready for a nap.
Also, continue to work on crating at home, and practice in your RV while you're at home. Do everything you can to make the crate a happy place. You can do that by feeding meals in it, giving a treat every time she goes in and things like that. Many people use crates for "time outs" if their puppy misbehaves, but I tend to think that's not a good idea. I want my dogs to only associate good things with their crates.