Can Uneven Eyes Caused by Canthopexy Be Corrected?

Dear Overcorrected,
Personally, I do NOT think the canthopexies are the major reason for your friend's appearance. Canthopexies are usually put in to support contact of the lower lid with the eye balls when some inflammatory drag by the lower lids is anticipated. But if GREATER support is needed, canthoplasties may be called for.
In looking at her from the top down, she has:
1. Very asymmetrical brows with arch collapse, Right worse than left. Appears to be a "bad Botox" result of the kind one sees done in salons.
One wonders IF the Botox mediated brow sagging led to the performance of bilateral upper lid blepharoplasties.
2. Uneven position of the upper lids with apparent retraction of the Left upper lid and OVER resection of fat from the upper lids (especially right central compartment) creating an aging, skeletonized hollowness
3. Rounding of the outer corner of the left eye with much more white showing leading to some inflammation. This side appears to have been detached or have a failed tightening procedure.
Personally, I would stop all Botox treatments. Keep the lower left lid outer area higher with tape at night and wait 6 months or so before changing anything surgically. The left upper lid may come done a lot and the left corner may come up some as well.
Take some pictures in the spring and compare to this one to see the changes. At that time, you will have a real idea what the permanent look is and would, if needed, see several plastic surgeons who specialize in eye surgery to learn from each what your friend's options may be.
Good Luck.

Yes, and no.
Eyelid conditions may be treated with reconstructive plastic surgery, but surgery cannot be reversed to put the eyelids exactly where they were prior to cosmetic surgery.
You have complicated eyelid issues based on the information presented, and only after a comprehensive examination can one be able to determine (1) all the issues, and (2) potential treatment options.
That being said, you are still relatively early after your lower eyelid surgery. The slight slightness of the lower eyelids may still relax, and help resolve the slight slant appearance.
The lower eyelids appear to be in potentially in suboptimal position. Canthopexy, or alternative lateral (side) eyelid procedures, may pull the eyelid upward and closer to the eyeball itself. There are many specific procedures, which differ depending on the exact cause of the eyelid malposition. Grafting with skin or mucosa may be necessary.
Lastly, the upper eyelids appear uneven on the photograph. Did you have upper eyelid surgery or brow lift surgery too? Speak with your eyelid plastic surgeon, and determine what should be the next step. Best of luck.