Yes she is

As the bottomless Heiress tries to let nature take its course, there was rustle near the bushes which cause the heiress to stop letting the flow go through and hold in it as she immediately stands and raise her panties. This, of course, causes some complication as she is holding her pee from leaking.

"Is there somebody there? I can't let them see me in such a disgraceful moment." Weiss thought. "Hello? Is anyone there?" Weiss said as she is holding her bladder.

"Just hold it in, if its someone you could try to find a way to have your private time, but even so you must not let it out, a Schnee does not pee like a child." Weiss thought, she refuses to show herself wetting in front of somebody, she would die of humiliation.

Thankfully for her, it isn't a person, though the bad news, when the figure comes out, it was Beowolf as the monster pounce out of the bushes, she blocks the claws with her rapier. The impact causes a slight jolt on her waist as she almost leaks it out.

"Dammit!" Weiss unexpectedly curse, while holding her position, she notices a few more Beowolfs appearing, without further ado, she stabs the Grimm in front of her to the neck and resumes in her position.

Weiss realizes that at the moment she was surrounded, and not to mention still holding in her pee.

"Oh cmon!"