When John Wick arrives at Marcus’ home, we see that Perkins was waiting for him outside, presumably to kill him. But then she gets a phone call and … leaves.
It was Winston who called, and he gets her killed at their meeting place.
Why did Perkins meet with Winston (instead of fleeing from him)?
It should be pretty clear to Perkins that she is disgraced for breaking the rules in the Continental, and when Winston (the owner) calls her to meet at some unpopulated place, she can’t really expect a friendly talk. So why does she meet with him in the first place? It can’t be her sense of honour after willfully breaking such a well-known rule.
And even if she has a good reason to meet him, why would she leave immediately instead of sparing a few minutes for trying to kill John?