I think Dany's a bit of a hypocrite. She didn't have much of a problem with Drogo's brutality or how HE was taking slaves to fund Dany's war for the Iron Throne (yes, she felt bad over the Medicine woman, what about the rest?) but when anyone ELSE does brutal slavery, she's PO'ed over it?
She felt bad for all of them but since she wasn't in charge, all she could do was claim the women and even that only worked because Drogo was in a good mood.
In fact, the first thing she did after taking charge of what was left of Drogo's Khalessar, was to free all the remaining slaves.
So, she's definitely not a hypocrite.