Determine whether or not your child is ready to learn the alphabet. Use props such as wooden alphabet puzzles and workbooks to introduce her to the concept. If seh shows an interest in these, she's ready to move on to letter recognition.
Display a poster of the alphabet near your child's artwork and other accomplishments, preferably at her level. Not only will she associate the alphabet with her accomplishments, she can also look at it and ask questions as much as she'd like.
Commit to meeting at the poster once a day. You may want to designate a particular time, when your child is likely to be interested.
Encourage your child to sing the ABC song with you. As you sing, point to the letters on your poster. Do not cover the letter with your finger; you want your him to be able to see it as he's singing.
Leave your finger next to Z, once you have pointed to each letter and sung the song all the way through. Using the same melody, follow and say the letters back to A.
Add an ending to the song when you've reached the letter A. For example, you could sing, "Now I know my ABCs--backward!--Won't you come and sing with me?"
Reward your child with encouragement and positive feedback, even if she doesn't say every letter correctly.
Ask your child to sing the song with you, away from the poster, from time to time. Do this while you're driving down the road or making dinner. Allow her to sing when she wants to sing, and do not force her.