Ok, then to be specific...
You have stated that dowsing does not work and therefore any energies 'detected by dowsing' would therefore also disappear in a "puff of logic".
Dowsing is an interesting topic in and of itself but not the original reason why I began this topic.
I placed this in the Skeptical Druid because I have been told in the past that "Ley Lines only exist in England", something I do not agree with.
Your responses however brings three questions to mind;
1. Are you saying that you believe Ley Lines were all discovered using dowsing rods?
2. Are you stating that there are no energies within, around, or flowing to-from these Ley points?
3. Are you stating that the Ley Lines do not exist?
Before you answer her are my answers to the same questions;
1. From what I can tell, the Ley Lines were first "discovered" using maps and compasses. Oxford's Dictionary describes it as "a line between two hilltops".
2. I have been to Stonehenge, Woodhenge, and Averbury rings; although I felt something I cannot verify it and therefore it remains UPG.
3. I believe that the megalithic sites were set up to interact with each other and therefore they ended up being on sighted lines ("community" connections rather than "metaphysical")
There are several stories of (for instance) the lighting of the Fires of Beltane wherein one set of fires were lit on Tara and everyone else lit their as soon as they saw the fires.
This presupposes that they would be able to see each other to begin with which is a supporting piece to why they would have each of these on "sighted lines".
A recent History International series proved that someone with a flag or fire on Silbury Hill could be seen at Avebury and West Kennet Longbarrow.
This was seen as a plausible reason for the construction of such a massive mound of limestone.
If you take a line from the Merry Maidens to the Hurler's (or King Doniert's stone) to Glastonbury Abbey to Silbury Hill a "Line" if formed; the "St. Michaels Ley Line"
I see the corollary in that if a pattern of megalithic sites form a grid of consequence you could also pinpoint all the pubs in London so that a similar pattern of "Pub Lines" would be formed.
Sources;
http://www.bbc.co.uk/gloucestershire/content/articles/2005/06/29/ley_lines_feature.shtmlhttp://www.ancient-wisdom.co.uk/leylines.htmhttp://www.sacred-destinations.com/england/england-map