Why didn't Maisie pee the bed when that Indoraptor was about to reach for her while she was cowering in bed?

That Indoraptor taught itself how to open the door to her bedroom (from the balcony) and find Maisie Lockwood in bed.

But while Maisie was hiding and cowering in bed, why didn't she pee the bed like any typical preteen chic would in that situation? Why wasn't there a wet spot on her pants when she left her bed?

That's what I was expecting, as scared as she got, but somehow that didn't happen, so I wonder why it didn't.