If this is a Elizabethan collar (cone) you may want to try a bite not collar or the pro collar from PetCo. These are less cumbersome for the dog and they still have good peripheral vision.
If you have a long strap you can put that through the collar and wrap it around her like a harness under teh front legs and around the belly.
Here is more on the other collars.
bite not collar:
homemade bite not collars:
Pet Co pro collar