My first thought is that, if your daughter is operating at about a 3rd or 4th grade level in language, Using Language Well, Book 1, and Spelling Wisdom, Book 1, might be a good fit. (They are designed to work together.) It moves slowly (2 exercises per week) and is very gentle, especially the first half of Book 1. Those lessons are designed to be done almost all orally, so you could do them with your daughter comfortably sitting beside you on the couch.
The way they work is you
- Turn to the lesson in Using Language Well and the corresponding exercise in Spelling Wisdom.
- Read the Spelling Wisdom passage.
- Complete the short guided-discovery questions on that passage; the questions are given in Using Language Well.
- Either transcribe the passage to practice handwriting and lay the foundation for spelling or help the student study the passage until she is ready to write it without looking as you dictate it.
The focus of Book 1 is more English usage, capitalization, punctuation, contractions, synonyms, antonyms, syllables, things like that. Book 2 is where it will get into parts of speech/grammar. I would encourage you to take your time working through Book 1 and then decide at that point whether she is ready for parts of speech.
My one concern in your situation is whether the longer passages would be too much for her. They start short at the beginning of the book but eventually lengthen. With her physical weakness, I’m curious whether handwriting might be an issue with the longer passages.
It seems like the approach of keeping everything in context—vocabulary, spelling, and usage/grammar—would help with comprehension. If you wanted to follow the psychologist’s recommendation on spelling in groups, you could select one of the words in the passage and build a group with it (book, look, took, shook, cook, hook, etc.).
Download the samples of ULW and SW and see what you think.