I was a primary TA for twenty years, and will give you a couple of items that may help:
ONE - 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.
TWO - 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.
Reception will probably be doing many other activities - maths, arts, crafts, PE, drama, music, dance, ICT, nature & wildlife, simple history & geography (often connected to the local environment). So how is she enjoying/coping with these kinds of subjects?