We had DD1 in preschool, she went one day a week, adn it lasted under 2 months.

I personally didnt like the affect it had on both girls. I had anxiety attacks every week in the lead up to preschool day. And I can say I never once enjoyed her being there. It just didnt feel right.
Shes the same age as your DD , mine will be 4 in september. I figure that really there is no harm in keeping her home this year. We will revisit the preschool thing next year in the lead up to kinder.
So in answer to your question, no I dont think it is all that bad not sending them to day care.