It's a brother CS-8150. I think you have to keep the compartment closed or it comes up with an error.

There should be an attachment that goes on top of the spool holder in the machine I can take a picture in the am but it allows bigger spools to be used I have the same machine

WOW, I've never seen a machine like this either. Looked it up but couldn't find any information on using a larger cone with it. Do you have a manual to show you how to use the thread cassette and possibly larger cone?

Quiltforme, should be the best person to help you with this as she has the same machine.

If all else fails maybe just purchasing the same thread your Mom likes in the correct spool size.

I have used the EZ Winder spools mentioned by an earlier poster. They wind from the bobbin winder that most machines have on the top of the machine head.

My main use for them was to split up cones for serger sewing as I didn't do enough sewing to warrant four or five cones of each color.