Hi everyone, I got my puppy Mocha (actually she just had her first heat so I guess she's no longer a puppy

) last April 2012. She is about 1 year old. My fiance and I got her here in Mexico, and will soon be traveling back to the USA next month. This will be Mochas first trip anywhere! I am so nervous! My biggest fear is that she will pee or poop in her crate or carrier on the airplane! She has never been in a carrier or crate before, so we will need to purchase one for the trip. The trip will be just about 4 hours in length.
How do I get over my fear?? What do I do if this happens! She will be in cabin, and I am so nervous! Any advise, tips, suggestions? Should I put a diaper on her LOL!?