Does anyone know the history of the female? Is she a first time mum?
Her behaviour is not looking to promising but its early days yet, the cubbing den in my opinion is to open, putting it next to the window like that was a bad idea! She's not being given the privacy she needs.
In the last 10 minutes she hasn't been near the cub, which is a concern, the next couple of hours will be crucial, hopefully when the sun goes down and the den becomes darker she'll feel more secure.
If she's a first time mum she'll be a bit traumatised by it all, but she seems to be distracted by some thing away from the cubbing area, peace and quiet is what she needs now.