As long as your daughter enjoys the flashcards use them. When she gets older it may be much more difficult so try to modify your presentations. Maybe you will find some useful ideas on my blog:
http://teachyourbaby.pl/index.php/en/ I have completed reading programme by Doman in English (standard flashcards, no pictures) and we are completing the Polish reading cards (this set is with pictures). When the child loses the interest pictures help a lot.
I am testing Brillkids programme now and I think we will do it as well as a follow-up to flashcards.