If you and your spouse haven't already had a heart-to-heart about discipline, now's the time. You may be surprised to discover that your views are quite different, and the one thing your child needs most right now is consistency. Naturally, you each had different experiences in your own childhood that will shape your approach to discipline. But you'll need to find an approach you both can agree on.
Your child can do well in either a strict or a lenient household (with limits on each end), but divisions in the household could be harmful. She won't know what's expected of her and will quickly figure out how to play one of you against the other. So sit down and talk things out. Get your strategies ready. Share some reading: The 1, 2, 3, Magic series (a book, workbook, and videos) is widely available and helpful.
Reading, thinking, and working together to develop a discipline plan is a simple, effective approach that has stood the test of time. Remember, the most important thing you give your child after love is discipline.