My daughters next door neighbour has put a padlocked gate across the access road at the back of her house which she bought from the council two years ago. The neighbour has given keys to the owners of the houses further down the lane who are directly affected, but it means workmen, window cleaners and the like can’t get through.
If your daughters neighbour has bought her house its possible she has bought her part of the lane at the back as well. In this case she may be entitled to put up a gate as long as she provides access for the houses further down. Unless your daughter has a right of way over the whole lane she may not have a say in the matter: she should check her title deeds to see what the position is, or ask a solicitor to do so.