You can avoid that in the future by having a single image in the Images_B folder and import it into LR. When you change the shared folder, you just have to locate the Images_B folder in the new location and it will show all the subfolders in it. If you don't have any image in that "root" folder (Images_B) Then you will have to update every single folder in it as you just found out.
However, if you are confident manipulating databases, it can be done updating directly the database with any tool that can open the LR catalog (which is just an SQLite database)
Use this at your own risk!!!
The following info applies to LR 5.7.1 (table fields might change between versions)
Perform the following in a copy of the catalog, in case something goes wrong:
- make sure that you previously added the new shared folder in the import dialogue (i.e. Elsie)
- Open the LR database in a SQLite editor (I use SQLite expert personal, but you can choose any of the available applications)
- you have to change the values of the shared folder in the table "AgLibraryRootFolder" in the columns/fields: "absolutePath"; "name" and "relativePathFromCatalog"
Note: depending on how you imported the pictures, the fields "name" and "relativePathFromCatalog" might be empty (null)
The attached image is a screenshot of the content of table "AgLibraryRootFolder" using the SQL editor where I tested the procedure explained here:
The following are the scripts (SQL) that you would need to execute to update the fields (I have used your shared folders names)
Script 1: update field "absolutePath":
update AgLibraryRootFolder set absolutePath = replace( absolutePath, '//Anne/', '//Elsie/') WHERE absolutePath LIKE '//Anne/%';
Script 2: update field "name":
update AgLibraryRootFolder set name = replace( name, '\\Anne\', '\\Elsie\') WHERE name LIKE '\\Anne\%';
Script 3: update field "relativePathFromCatalog":
update AgLibraryRootFolder set relativePathFromCatalog = replace( relativePathFromCatalog, '//Anne/', '//Elsie/') WHERE relativePathFromCatalog LIKE '//Anne/%';
Open LR with the updated catalog and everything should be in place.
Remember: Do this in a copy of the catalog in case something goes wrong