I doubt if it's dyslexia. I suspect it's more a matter of commitment- that "in this age of electronic communications", there is no longer a requirement to learn to write clearly and logically, and that the machine will take care of the spelling. The attitude seems to be a little like our attitude to rhetoric in spoken debate- that it's no longer relevant. In the case of rhetoric, there's some justification, in that it was used as often to fool the simple listener as to forward the considered evaluation of issues.

Perhaps you could get her to "show her working"- to write notes on what the important issues are, to write a line or two showing why the issue is a problem (or not), and to write the report and its conclusions from the notes.

I also think that the formm in which undergraduate exercises are presented often gets in the way of proper discussion. They are often told to write x hundred or thousand words on a subject- I spent so much time with my own youth trying to get him to read around the subject, only to be told that there wasn't space to get it in the space available, so it would be wasted.