Kids can be very easily scared. I don't see the point in showing that to then when u know they'll freak out. They'll have nightmares. Wait a few more years.
I would think primary 5-6 seems ok. They would understand more instead of scare. Or can prep your daughter about it?
last time during kindergarten days, we had school outing to Haw Par Villa
For me I would wait until primary 6.
Primary 6 would be ideal...(:
Kidson Ong