Just putting this out there... when we had trouble, we found they had no control over animals *inside* the house unless they are a protected or permit only species.
We gave up after a while because keeping them in the garage just wasn't good for them... but in retrospect, we could have made it...
The fact that the rats were IN her garage is evidence that she doesn't have a rodent-secure building. For a house, all ingress points should be covered with mesh like soffits, dryer vents, etc.
And what drew the rats to her garage? They are usually seeking food (garbage?) or water.
We had a...