J.S.
I will gently say that I think you were mistaken when you responded in a punitive way to her drawing. Kids her age are naturally curious. There is no moral connection to her drawing, but by making her feel as though she did something wrong, she is likely to equate 'sex' with 'wrong' and also less likely to come to you with questions.
Why is she starting counseling?!?! I am very concerned and confused about your response to this. An 8 year old girl should have a firm grasp on the different anatomies of male and female, and should have at least a basic concept of reproduction.
I see that you are 24, which means you were quite young when you had your daughter. Are you scared that she to is going to have sex young and possibly also be a teenage mother? The best way to prevent this is to maintain and open and honest relationship about sex. Keep talking! Let her get her information from you, and from quality books that you provide.