Try and be as clear and accurate in your own pronunciation when you talk to her, even exaggerating certain sounds if necessary.
So that she knows what letters form what sounds, this inexpensive and easy to use book, can encourage children with reading, spelling and writing is mentioned in the MN Book Reviews section. In “Children’s educational books and courses”, the Oxford Phonics Spelling Dictionary presents words by their initial SOUND, unlike a ‘normal’ dictionary, which is always in alphabetical order. Thus, in the ‘S’ section are words like ‘cinema’ and ‘cycle’, which have a ‘S’ sound, even though they are spelt with ‘C’.
The Dictionary is colourful and amusingly illustrated, and can be used by children on their own, or with adult support, from Reception age right up to the start of secondary school.
The review has a link to view sample pages, and purchase if you so wish.