Racing to the toilet, Olivia doesn’t make it on time and ends up wetting her pants in this scene.

Badly needing to pee, Olivia rushes to the bathroom, but starts to leak into her pants before she reaches the toilet.  Arriving at the bathroom in front of the toilet, she is already starting to wet her pants.  She briefly pauses, trying to stop the flow long enough to get her pants down, but is unable to stop.  She ends up sitting on the toilet, pants still up, and pees through her clothes.  As she sits there, wetting herself, the shame of her accident sinks in.