If you are using the crate to help in housetraining, then you want the crate to be big enough for the pup to stand, turn, and lay down comfortably in. Any bigger and you could have problems. If it is bigger then you need to section it off by putting a rubbermaid container or something similar to take up the extra space. Make sure it is not something the pup can chew and get hurt on.

Invest in a buster cube or treat ball. At 2 months the pup is probably still getting fed three times a day. Put the pups dry kibble ration in the treat ball and place it in the crate before you leave for work in the AM. Let the pup get soooo interested in trying to get the kibble from the cube or ball that she doesn't even know you are in the room. Don't say a word but quietly walk out the door. No "I'll see you in a little bit" or "Mommy will be back, sweetheart". NOTHING comes from you. Once the pups done with the treat then she may carry on to get out, but your not there and she will quiet down and rest.

Make sure you make the crate a nice comfy place with chew toys and water available (easy on how much water though). And make sure you exercise the pup before thinking of putting her in the crate.

During this period, I always feed from the treat ball so they get adjusted to the crate and it gives them something to do. They quickly associate treat ball with kibble and crate.

Remember though that your goal is to get the pup out of the crate as soon as fesable. This is not a total substitute for obedience work to get the pup to listen to you.

Hope this helps.