Hi Kitty,
I've quilted queen size quilts with my Bernina 1031, it has a mere 6.5" throat space. Its doable, you just have to sorta drape the quilt around the machine. Don't roll your quilt as it makes the quilt too hard to handle, accordion pleat your quilt that helps also. Quilt from the center out and make sure its well basted about every 3-4" using the curved safety pins.
Leah Day has some very good video tutorials for machine quilting on your DMS. Here's the link to her Youtube website:
https://www.youtube.com/user/lcvday
Sharon in Texas