My old girl Ella had a shattered rear leg from being hit by a car. My options were amputation or surgery. I opted for surgery. She did have a plate inserted but that was because she had bone pieces removed and the plate was there to connect what was left of her leg bones. We had casts, lots of casts. The vet told me to keep her quiet, not let her roam around, absolutely no stairs, and to wear an e-collar if not well supervised. Ella did not listen to the vet. I blocked the stairs with a baby gate but she managed to jump it while wearing the cast which went all the way up her leg. She perforated her e-collars to where I could use them as colanders. I also had to find a high calorie food (not high protein but high calorie) because the veterinary surgeon said she would need twice the caloric intake in order to heal quickly. I ended up hand feeding her a mix of kibble and canned food. She healed fast and well. Ella ended up with a slightly shorter rear leg but she could still run like the wind. She lived 11 more years and died at age 14.5.
I have seen photos of the halo type device on one of the Facebook groups, "Basenji". You may have to join the group but here is the link to the post https://www.facebook.com/photo.php?fbid=1904813413071092&set=gm.1407068002664730&type=3&hc_location=ufi
I am sure you can contact the owner of this dog, Maria Eriksson, but please remember that English is not her native language as the "Basenji" group is international.
I recently purchased these seat "tethers" for the car. You need a car that has latch bars for child car seats (required in US cars after 2-27-2014). I purchased two because I was picking up a new older dog and did not have room in my car for a crate (2000 mile trip x 2). The carabiner latch is easy to use. I was concerned they might chew the straps but so far so good. I read too many account of Basenjis slipping out of car harnesses or getting tangled up in them on various Facebook groups. These tethers are working very well for me. My dogs wear martingale collars (when they wear collars). http://a.co/4Z873Wy
Whatever you do, do not purchase anything that secures using the normal seat belt latch. The seat belt latch can break or get jammed and can cost you plenty of dollars to fix.
Have you called the shelter you got her from for help? Were there any health guarantees, aid, or continued veterinary help that the shelter provides to the animals they re-home? If the tapeworm treatment they gave her didn't work they would want to know that information. Call the shelter and ask to speak to their vet.
@jalex Grab her gently around the muzzle/nose (think your middle finger and thumb) and strongy say "No Bite!". Holding her around the nose like that is similar to what her mother would do to discipline her. Be gentle but firm, she will eventually learn.
BTW I think you may have a full bred Basenji pup who will eventually grow into those giant ears. Think of her as being in those awkward tween years. Many shelters mislabel Basenjis that aren't the more typical red & white coloring.