How to alert a medical professional about a patient while they are on break

I’m a recent medical graduate working on a inpatient child psych unit as a tech and had an overnight shift with a young nurse (she gave off this ‘hater’ vibe like if she wanted to be a doctor but couldn’t or didn’t go for it or something ever since I met her).

So shes the ONLY nurse on the unit and a young child wakes up out of bed C/O abdominal pain.

I knock on the door of the break room multiple times. No answer. I open the door and tried to use my voice. No answer. I had to touch her...

How to alert a medical professional about a patient while they are on break