It will have to be looked at every year anyway, so if it was me, I would write in what is pertinent now and possibly in the next year. Reduced assignments and extra time is a common modification of all sorts of diagnoses. She can prove she knows the spelling words and practice them so many different ways. She can spell them orally to the teacher. She can practice them whichever way works for her. Or, if spelling is a huge issue, she can have less words. A 504 is not legally neccessary for a teacher to do what is right for a kid. When I was a teacher, it was totally in my control, to modify/change, reassess, work with a child any way I thought was right. I didn't need a 504 or IEP to do that.
