This is when you send back: "Your request cannot be processed as insufficient data was included in the original email. Please specify required format." And you repeat that line whenever she contacts you until she gives an answer. No matter what else she says. Just keep spamming the same message.

Stop sending it until she describes exactly how she wants it. Tell her that you have other clients to work with and that you can't spend all day on this

Try open document format (open office)

YDI for sending it 5 times without getting the proper specifications. If she won't give you the information you need don't waste your time on her. Just make sure you keep copies of the correspondence in case she tries to start shit for you with your boss.

Pdfu format? That always works.

Contact her boss and your own boss and let them know how much of a dumb employee she is, and how difficult she is to work with.

Change the entire document to white font and send that to her. Stupid annoying person

As others have said.. PDF will work on anything so if she she says the same thing to PDF just don't bother wasting your time.

Send it with FU one of two things will happen she won't get it and still badger you or become pissed which if it were me be worth it

Ask her to send you a sample of what she wants. Then you'll know.