Now WHY didn't I think of that?

My Girl is at the "Why" stage of childhood development/milestone. She asks a "Why?" for just about everything and adds a "but why?" and a "Yes... but why?" till she gets a satisfactory answer or one which she feels is satisfactory or she'd ask "Why" again immediately after you answer a question. Sometimes after all the "Whys" she answers the original question herself. And her answers often makes more sense than mine. Hahaha. Here's an example:

My girl playing with my handbag strap.

MG: Don't put my handbag over your neck.
My Girl: Why?
MG: Because cannot
My Girl: Why?
MG: Because mummy say cannot lah!

After a while, apparently still not satisfied...

My Girl: Maybe its for your hand only
MG: Yes! Yes. Thats right its for mummy's hand only. (Now why didn't I think of that? Hmmm.)
My Girl: Why?
MG: Because its for the hand only lah! Not for the neck and stop asking so many questions. (Now, everytime I say this, I want to kick myself because I feel that I should not discourage her from asking questions to satisfy her curiousity and to learn. Why, I'd be very guilty indeed if she becomes afraid to ask questions in school later on because of this wouldn't I? Now this goes on in my mind everytime but I can't help myself after the "whys" get a little too tiresome. Bad momma.)
My Girl: Mummy, maybe its a hand bag not a neck bag!
MG: Errrr... Yes. Yes. Its a hand bag not a neck bag.