I assume you've SEEN her and are not basing this on an empty queen cell? Depending on the weather, and other factors, it can sometimes take more time than you might think for her to start laying. I'd give it another week and take another look. If no eggs/larvae you might begin exploring purchasing a queen or doing another split.I made a split and the new queen emerged 7 days ago. I just checked the hive and did not find eggs. About how long is typical for a new queen to start laying?