But you're not being tried for terrorism, if you suddenly were tried for blowing up planes, what you searched in Google would be used against you, this happened to a couple of people in High Wycombe a few years ago. Google store everything we have ever searched in our lives and it has been used in cases before with success.
Though I agree there is a lack of physical evidence, her behaviour during those 31 days are more than suspicious, the fact her car smelt of a dead body with traces of chloroform is definitely more than a coincidence, she may not have killed the kid deliberatively but the 'cover up' had more holes in it than a golf course . As I said before I wish the Scots Law was able to be put in place for certain crimes like this one.