First put all of the files she wishes to upload in a .tgz file created from the directory newproblems by
tar -zcvf newproblems.tgz newproblems
then choose "File Manager" from the webwork instructors page.
choose "Browse" to find the local .tgz file.
Choose "Upload" to upload and unpack the .tgz file in her template directory in the subdirectory "newproblems".
The problems are now available after choosing the "Local problems" button in the Library Browser.