Concours77
It might be a good idea for you to get your niece to translate the definitive (French) version of the Final Report which differs from the English version in several respects.
In particular, in section 1.16.3 it states that the two ADRs failed between 2:10:3.5 and 2:10:05 and that the FBW reverted to Alternate 2B at 2:10:05 and stayed in that mode thereafter. So we do know the timing of reversion to direct law in roll - no supposed eleven second delay.
Then in section 1.16.4.1 it states that " lorsque le pilote automatique se déconnecte, un gradient de vent latéral concomitant (20 kt en 4 s) engendre le départ de l’avion en roulis à droite ;" so we do know the source of the uncommanded roll. Fig 64 of the French version shows a simulation of what the lateral response of the aircraft to this turbulence would have been with and without the actual pilot input. Note that this data does not exist in the English version.