Hi walaa’ ,
What an interesting case study , thanks for sharing !I think her problem was all about fear to lose her image in-front of people and that people will bite her by their looks and talks from behind! And that fear of this looming danger deteriorated her vision so she’ll not see anything her body was trying to help her not see any of these looks and to help her not see her daughter going through what she went through! 
She was separated and was in stress phase of this Cerebral cortex fear of people’s looks! ( minus response, decrease in function )But when she took care of her husband before death that definitely improved her image in her opinion in front of  people and she began regeneration phase / but there came the overlapping stress trigger of her daughter’s problem which brought the same fear to her , she’s afraid again of her image and people looks and afraid of this looming danger that’s surrounding her again putting her in the same circumstances she lived before ! I guess that prolonged her regeneration phase and brought that loss of vision and KCT aggravated the symptoms ! 
This is my vision towards this , hope it helps , may be wrong and may be right but I wanted to share it with all to have a broader vision by bringing our ideas towards each case !
Well done walaa’, that’s really helpful ! I hope you can  reach resolution with her , I totally believe you can :)