What happened to Kate Middleton between Februrary 21 and June 24?

To illustrate a gap in coverage on Google Trends, let's focus on a current Hot Trend search: kate middleton. If you click the link, you'll see the search volume for June 24. If you then search for kate middleton on the regular Google Trends, you'll find a "Trend History" that ends on February 21.

What about February 22 to June 23?

Google is able to produce almost-real-time data for hot searches. So, why not data for the past few months?

For many top-rising searches, there won't be much prior data. But for a periodically popular query such as "Kate Middleton," there would be.