The concept of $ ...hmm..

On tuesday, I brought my darling out for a while. I was lazy, so we took a cab. When we reached our destination, I took out $ from my wallet and paid the taxi driver. When we took a cab back, my little one reached into my wallet and took out the cash and handed the cash over to the driver. I thought that was quite amazing and interesting...

This morning, my domestic helper and I brought her out to buy breakfast. Guess what, she took my $10 note and tried to hand it over to the malay lady serving us :) hahaha :p

Now I am wondering, does she already have some concept of $?