processing speed?

Hello,
My question concerns an adult student diagnosed with ADD.
While the student has seen improvement with medication, behavior management, and
environment modification in areas like focusing on tasks, staying organized, and
planning time, she still has marked difficulties at the college level. These
mainifest particularly as poor reading comprehension/trouble learning from
books, slow expression (written and oral), difficulty following directions
(written and oral), and trouble remembering math formulas. The student does not
seem to have the classic symptoms of dyslexia since she can decode quickly,
phonetically or using sight words, and her spelling is good. She had some
testing that also revealed very strong visual-spatial skills, so NLD seems
unlikely. The student has subjectively described the problem as seeming like a
difficulty connecting the words (in graphical or auditory forms) with their
meanings (same for math symbols) despite having a very high IQ and no problems
with "superficial" decoding. The student has also mentioned that there seems to
be a time lag in processing what is heard or read - she can "hear" or "read" the
words quickly, but they are not fully processed, and she cannot easily moderate
her reading speed to match her rate of comprehension.
Since various therapies have helped many of the major ADD symptoms, is it
possible that these continuing problems
are related to a subtle learning disability? It seems like there may be some
processing speed issues since the ability to comprehend is there, it's just not
happening at the rate it seems like it should given the student's motivation,
preparation, and overall intelligence. The student is also acutely aware that
problems exist, but doesn't know to what to attribute them nor how to get around
them. I know there are tests like "rapid naming" of letters and numbers, which
can be problematic for some with LDs, but is it also possible that a student who
does not have difficulty at the "recognition" level could have a processing
problem at the "association of visually- or auditorially-recognized word with
its meaning" level (for both decoding and encoding)? Is this a language problem,
or something else? How could such a deficit be substantiated and remediated
and/or circumvented in a college environment? What teaching strategies might be
employed to help the student "access" the material (I am particularly interested
in strategies applicable to advanced science instruction and am already aware of the
student's "visual" and "kinesthetic" preferences)? What strategies could you
recommend for the student?

Thank you.