Are you only doing "2-D"/flat/static (whichever word you prefer) type things for the multiplication? A multi-sensory or 3-D ideas might help if you haven't tried that. With my DD it helps for her to see the equation on a card or PC screen, but then make her own groupings with lego pieces or abacus etc. the association of real objects seems to help lock in the fact.

Maybe somewhere in this document there are some ideas? Or another doc on the site.

Enseignement
Multisensoriel
Simultané
http://www.dyslexiaassociation.ca/francais/files/ems_f.pdf
from
http://www.dyslexiaassociation.ca/francais/publications.shtml