health- I think you are wrong about the criminal part. If you think a crime has occurred and you are wrong then it just means you’re being a vigilant person. They will not arrest you because you reported a crime. If you MAKE UP a crime to have some fun then yes, there can be some legal trouble for you.
I’m not saying whether I agree or not to call the police (it doesn’t sound like her life is in danger) but you’ve made it sound as if you can get into trouble everytime you call 911. If someone thinks there house was robbed but it wasn’t then they wont get arrested, it’s the same thing here. She thinks she is being followed but (let’s just say)isn’t, she will not get into legal trouble for that!