No need to shout with capital letters. We can all read.
This is 100%.on you and represents a careless approach to your own personal safety. You should count yourself lucky that you suffered no personal harm and that all you lost was an iPad. You have to take responsibility for your own actions and one of those is not inviting strangers into your room at night.
The fact that the room key was disabled suggests to me that the stranger found a random card key and swapped that for yours when she stole your iPad. While it's always possible that the front desk issued her a new card key, I'm not sure why you have jumped to that conclusion.
Finally, the fact that you are pursuing this with the property, but not the police, opens a lot more questions.