A: Feed her in the crate, at least initially. When she's done eating, remove the food. Get her used to the idea that the crate is where she should be.
B: Play with your pup, with a toy or something she seems to like. Put it in her crate, or toss it in as part of the game, let her go in and get it. When its time to put her in the crate, put the toy in with her.
c: Make the crate comfortable, like folks said "cozy". Get a washable crate pad, don't use newspaper.
d: The instant she comes out of the crate, take her outside to pee/poop. If she doesn't do anything, don't put her back in the crate, but don't reward her. If she does pee, praise her lavishly, and take her back in to open play.
Repeat these, and unless she's brain damaged she'll learn in a VERY short time and will NOT mess up her crate.
Good luck, great looking black lab.