I would try and get away from the idea of "teaching letters" and focus more on creating experiences and opportunities to talk, explore and discover. The most capable children who are confident reader and writers, have a strong vocabulary. So focus on this before letters. Becoming literate is so much more than recognising letters and there are so many skills that need to be learnt before knowing letters is important.
Children of this age learn best through play & self led exploration. Not adult direction. So listen to your child, and look for short 'teachable' moments with what she is already doing, playing with and looking at.
For example- When reading favourite books occasionally run your finger along the bottom of the sentences, in time with your reading, and emphasising your words. For example if there is a sound effect like Woooooooooosh! Your finger would move fast as you say it. This is introducing the concept that those symbols (letters & words) have a significance. That different letters make different sounds. The same sound usually comes from the same letter ...
Play around with language and sounds. Alliteration to emphasise letter sounds. Big bouncy baby! Silly words: bubbly bibbly bubby! Making up songs, singing favourites and playing with words is one of the most powerful literacy teaching tools. You don't need to buy any special equipment or letter teaching resource. You have words and letters all around you.
The most meaningful letters a child will learn first are the ones from her own name, Mummy and Daddy (and siblings or pets if you have them) If your child's name is Sally, you might start pointing out her name on her nursery bag, maybe you have it on her door, so you might create a habit at bed time of pointing out her name and emphasising the sounds as you point to the letters and say her name. Short, meaningful teachable moments.
Pretty soon Sally will recognise her S in other places. This opens the door to further 'teachable' moments. "Yes Saaaaa for Sally, but this is Sam's name. Sam and Sally both have Saaaa"