Personally, I would suspect something more serious than "body odor". I would check to see if her teeth were bad, first of all. Decaying teeth can be very smelly. Ear infections can also have a very bad smell.
A trip to the vet to determine the root of the odor is definitely in order...

Along with the suggestions of the other poster it could also be her anal glands, they may need expressing. Definitely a vet visit is in order and the sooner the better. If it is teeth, ears or anal glands they will NOT get better on their own.

Please see a vet as soon as possible.

My Doxie also has a full-body odor, not just her mouth, or rear, or ears. Again, HELP!!!