I was a primary TA / helper for over twenty years. I will give you a couple of ideas that may help; use them in a 'fun' way, when she feels in the mood to read or write. Don't 'push' or insist, try and let her set the agenda:
ONE - Don't restrict her to 'easy' books, but sometimes share between you much more challenging books, including non-fiction of topics that interest her. I give below technique for this (but it was for a boy, so ignore gender change):
?When reading harder books with a child, get him to point to words as he goes along. If he knows the word, or can sound it out, he can say it. If he doesn't know the word, he can hover his finger over it, and YOU say the word for him. Don't stop to analyse or discuss the word at this stage, but try and keep the 'flow' of reading going. Review difficulties at the end, if you wish to.
This way, he has the satisfaction of reading more difficult books, without the fear of getting 'stuck' on words.
TWO - An inexpensive and easy to use book, that can encourage children with reading, spelling and writing, and really help them to understand Phonics, is reviewed in the MN Book Reviews section. Just search ‘Phonics’ and my name.
(I also have hints for Numeracy and Writing, so let me know sometime if you would like to see those.)