Advice please re neighbour

[BluePeterVag]

My elderly mum lives alone. She has a support bubble with us and we have been to her house (helping her change bed sheets, hoovering etc) and she has been to our house for a change of scenery.
One of her neighbours has reported her 3 times to the Police for breaking lockdown rules. She is not breaking any rules, and each times the police have called to investigate and been apologetic with no action taken.
She cannot know who has reported her, but can she make a harassment complaint to the police against the person who keeps reporting her? It is wasting Police time and causing her unnecessary stress. My Mum has CCTV and is able to prove that it is only me coming and going, very rarely actually, yes the person still reports her. This can’t carry on. Any advice?

[BluePeterVag]

It’s horrible isn’t it. It feels quite nasty. When there was the first lockdown we stuck the rules and didn’t see each other at all. Even when she was really struggling.
It feels very targeted. I’m hoping it stops. Thanks to everyone who has responded.