EMail Attachment Problem

I have a client who has a WinXP-Pro PC with Outlook 2002. Whenever she wants to write an email with an attachment (i.e. PDF-File) the attachment shows up in the large white area of Outlook where the text is written. Usually there is suppose to be a little section near the top of the message window where the attachments are placed, but it is not showing up for me. What can I do?

Thanks

Kirk