It's very hard to get a 2 year old cow ready to show in two and a half months. All the pairs that you see winning either have a very young calf, or a calf that's just about to be weaned. Almost three months in is probably one of the hardest times for the momma cow. The calf is taxing her fat reserves, she's getting bred back, and trying to stay in good enough shape for both. Not to mention, it's going to be very warm soon. Your best bet is to get her on some higher fat content feed and start working on her. About two weeks before your show, start to day wean the calf a bit, letting it nurse good early in the morning, a bit at noon, and then let them be together at night. It would be ideal to have an older calf that you could completely day wean, but I've done it this way some too. Good luck, pairs (especially 2yr old cows) can be a real handful!