If she's truly capable of producing the assignment orally, dictation software might be a good option. But the skills needed to succeed in a one-on-one discussion (where the other person provides a fair amount of organizational scaffolding) are not at all the same as the skills needed to produce a long written work (where you have to do all the organizing yourself, and organizational flaws can't be disguised by the organic flow of discussion). You have to have your whole topic in your head for both, but the purpose of a writing assignment is not just to demonstrate that you have the whole topic in your head.
I'm not saying it's an unrealistic thing to ask; just that it may fail to both accommodate your DD's weaknesses and satisfy the teachers that she's demonstrated the equivalent skills.
