I took the liberty of scanning back over your past posts, and saw that, in her early testing, while verbal and fluid reasoning are MG, and the CPI indices (WM & PS) are closer to HG, VS is merely age-appropriate. This is a pretty striking relative weakness in VS of 2 to nearly 3 SDs relative to the other indices. I understand that it was of ambiguous significance at the time, but you now have many years of IRL data to support its clinical significance.
In combination with your functional observations of years of struggle with aspects of math and various visual skills, I would certainly wonder about an LD affecting visual spatial/perceptual skills. This is not incompatible with strengths in logic and mathematical reasoning. (Note that FR was in the GT range.)
Some strategies that can be helpful:
-work math problems on graph paper, to help with alignment and spacing of numerals
-have her highlight operations according to a color key, prior to beginning calculations. (To draw her attention to the correct operations.)
-highlight key words in word problems, perhaps with the same colors used for the corresponding operation symbols.
-using visual frames/masks and guides, to screen out extraneous images when focusing on a specific problem or task.
-using a brief self-monitoring checklist for reviewing her work for common errors before turning it in. (I use 3 questions with my children: did I answer the question? does my answer make sense? do I have the correct units?) Hers may be different, and may even change from time to time, as she masters different skills. (e.g., did I use the correct operations? did I transfer my answers correctly to the answer sheet?)
-verbal mediation of visual spatial tasks: pair concise verbal directions or cues with visually-oriented multi-step tasks, so that she can use her strong verbal reasoning and memory to support weaker visual spatial skills.
