Your daughter has a challenging set of problems and needs the highly specialized care of pediatric ophthalmologists well into her late teens. As much as you would like to have this information it's not possible to give you a % chance as you asked. Your best source of information are the ophthalmologists that are treating her and who can look into the eye...
A Weiss Ring does not dissolve, it's a permanent and normal part of the eye. It only becomes visible when it puts away with a posterior vitreous detachment.
Mine is still there. I can see it anytime I look for it. As I have said for most people the brain "tunes them out" (neuroadaptation) and 98% of the time I don't see mine.
See the retina surgery. You need a thorough evaluation of the back of your eye especially the macula. You may have macular pathology. Yes I also tell my patients not to have yag laser or vitrectomy treatment of floaters. Far too risky and much less successful to warrant taking those risks.
No way to tell you how much to worry until you see the ophthalmologist. This could be a simple glasses problem like uncorrected farsightness (hyperopia) but could also be a sign of something more serious that may require the ophthalmologist to do more testing.
The most important thing is to see the cornea specialist. Be sure he/she is an Eye MD ophthalmologist physician. This is not related to stress or your injury. There are a number of things that might be done to help you including treatment of blepharitis which usually is present ( use the search feature and read about blepharitis treatment), antibiotic ointm...
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