Kathleen Kenyon's Jericho theory falls flat

In the 1950's, Kathleen Kenyon determined from excavations at Jericho that the walls did not fall down as the Bible records and that the city was not even there at the time of the Israelite conquest around 1400 B.C. However, more recent excavations (deeper down) has revealed that the city was standing at the time and that the large city walls did indeed fall flat as recorded in the Book of Joshua. Additionally, there were remains of scorched grain found in storage areas. This would not have happened during a normal, lengthy siege by an invading army. The grain stores would have been depleted. The evidence does, however, align perfectly with the biblical account that the city fell after only seven days and that everything in it was burned.