What are things she likes? Eg cat, butterfly, princess, pets name etc... use these words of interest to start learning about the alphabet. Cut out or print up a picture of something she likes (with her help).
Buy magnetic letters (lowercase in particular). BE EXPLICIT by showing her and telling her the name of the letter that her word of interest starts with..."This letter is called 'p'. Princess starts with the letter p".
Get her to move her finger along the letter to feel the shape (the way you would write it). Lay out several mixed letters including more of that letter and get her to find them... remember to get her to say the name of the letter each time... "Can you find another letter p?" Find that letter in books (the word doesn't have to start with it, you just want her to recognise it at first).
Then introduce the sound by saying something like " We call this letter p. The sound of p is 'p' like in princess. Can you find the p in princess?" Remember to be explicit. Write 'princess' under the picture and circle the p. Put it up on the fridge with the letter p magnetic letters. Have it there for how ever long it takes to learn it (hopefully a few days at the most)... before starting on a new letter.
Over the next day or so show her how to write the letter. If she is having trouble, write it so she can trace over it. Show her where to start. Get out the magnetic letters and get her to feel the way it is written. Put that up on the fridge too (somewhere accessible). Put some sand in a tray and get her to write the letter in the sand tray, or give her a paint brush and get her to write it using water on the ground outside... just some ideas.
As she is learning the letter, see if she can HEAR other words that have the same sound as the letter. Write them down, find pictures or draw pictures.
Words of interest will mean more to her than words you select or words you get from alphabet books. The word eg 'princess' will work as a prompt for the letter p in the future (is that is a word of interest to her).
Maybe make some of it into her own alphabet book (just staple it together) and revisit regulary... "What is this letter called? What is the sound?" As she gets the hang of it you may give her examples of tangible items for more difficult letters eg umbrella for u. When she has more letter sounds, go on a house or garden hunt to hear letters of items. Remember to make it something that she can relate to! No point telling her g is for goat if she doesn't have much of a concept about goats.
Good luck:) Don't push her too much. Keep it fun!! I hate printouts. I would sooner get her a blank scrap book and tell her it's her writing book, give her some pencils and let her use it in her own time to do letters and writing (just for fun, any writing at all, no teaching).
A good website is www.starfall.com or http://primaryhomeworkhelp.co.uk/interactive/literacy.html#2... lots of great alphabet games and activities.