You can contact Pfaff for the location of a service technician or call you LQS and see if they have anyone they could suggest in your area.

Can you post a picture? You have a lot of Pfaff owners on this board, I know a picture would help. Without seeing a picture, you might start with taking the foot off and then put it back on again. I have had the foot not sit correctly, but it still stayed on (sounds dumb, but it's just one of those things). Also if the person doesn't know how to sew, where did she get this machine? Because I'm wondering if the foot is even the correct foot for this machine? You can always try another foot to see what happens (my Pfaff comes with all the different feet you could ever think of and my machine is old), because you might have a generic replacement foot and they don't always work on all machines. You might as about a repair person at the local quilt ship, sometimes the owners know of a good one and sometimes the owners are able to fix small problems because they own that brand of machine. Good luck

If it's a vintage Pfaff, you could check with the Vintage Machines section of this board. They are very helpful. Does it have a model number on it?

This is what I was going to say. Many times oil (not always the right kind) will harden on the inside and not allow the presser foot to lower.

It sounds like you have a Quilt Expression. Look at the white lever that raises and lowers the foot. When you feel the underside of it can you feel a bump? That bump slides. If it is toward the operator the foot does not go all the way down (free motion setting). If it is away from the operator the foot should go down to the feed dogs.

If it is like the pfaff I recently used the foot went down when I pressed the foot pedal . Took a it of getting used to.

Take it to a Phaff dealer....tell them you are not familiar with the built in walking foot, can they show you how to lower and engage the presser foot....but they wouldn't charge you.....or if the same feature is on a Phaff machine in their store, ask how it works.....BTW WHAT MODEL IS IT?

I go to Ashby Sewing in kennesaw, Ga. Mark use to sale Pffafs and still services them. There are some of the older models where parts are no longer available due the sale of the company a while ago. The small companies that made the parts closed when Pfaff moved the plant. He usually has most stored at shop or can do adjustments. It is located just across from airport in Kennesaw on Old Hwy 41. Have not had good success with the dealer in Duluth . This dealer also has an outlet in Alpharetta. Many friends have had good luck with the New machines with them but not repair work on older models. Mark at Ashby's will help you if it can be fixed. He's worked on all 3 if mine for over 15 years.

Presser foot issues
 

Don't know your model but on one of mine, near the take up lever is a switch to release the presser foot. Good luck!

I'm wondering if the machine is a low shank and she has a high shank foot on it?