Again, stop taking shortcuts. You have skipped several important steps.
Yes, you could go delete her secure.mdw, but what if someone takes the file
home? Or what if you add a new computer?
Also, if a user deletes all the mdw files on their PC, then starts Access up
again, it will create a new mdw file.
You have skipped at least two MAJOR steps.
You should have removed all access to the objects in your database from the
"USERS" group. If you had done this, then no matter what mdw file she used,
she probably would not have been able to get to any of the objects.
Another step you should have performed is to secure the database file. If
you had done this, when she tried to start the file, it would have told her
that she did not have the needed mdw file. The same error would occur if
someone took the file home, or created a new "clean" mdw file, or if a new
PC is added.
You don't need to copy your mdw file to all the PCs. What if you want to
change someone's security? You plan to go to every PC? What if you fire
someone? Are you going to go ask them to move away from the PC so you can
lock them out of the file while they clean their desk?
The workgroup file should be on the LAN in the same folder as your backend
file.
You should NOT be replacing their workgroup file with yours. IF they create
their own file or try to open a template or a separate database, they should
not be logging into your workgroup file.
STOPPPPPP! Step back, and do this right. You are digging in deeper.