'She' needs her face slapped with a haggis. And they won't find what they are looking for, because:
...in Cromer, Norfolk, close to the North Sea coast, and in other places on the British Isles, 'forest beds' have been found. The name dervives from the presence of a great number of stumps of trees once supposed to have grown and rooted where they are now found. Many of the stumps are in upright positions, and their roots are often interlocked. Today these forests are recognized as have drifted : the roots do not end in small fibres, but are broken off, in most cases one to three feet from the trunk.
Earth in Upheaval. First published in Great Britain in 1956
In the Mabinogeon, the waters between Britain and Ireland are known as the Sinking Lands, an apparent (very ancient) memory of former dry land, now recalled only by the broken-off submerged forests.