Does she have 1571 active on her phone line? If so she needs to delete any unread messages.
If not, try this to check the modem.
Go to Dialup Networking and Make new connection, leave the Area Code box blank and in the Telephone Number box put in 08451121212
for the ID put anything you like "fred bloggs" and the password also anything you like "123456" etc.
Give it a try.