"Any person who without lawful excuse destroys or damages property belonging to another..........being reckless as to whether such property be destroyed or damaged shall be guilty of an offence " {Criminal Damage Act] It's possible to commit the offence by being reckless.
Trouble for any potential prosecution is that 'reckless' is more than 'careless'. It amounts to a course of action which is itself is done knowingly and which any reasonable person would see must result in damage.If I am throwing rocks at people in a greenhouse, it's no answer for me to say that I did not intend to break the windows which got broken! It would be obvious to anyone else that that was a probable consequence, and my blind stupidity, however genuine , removes intent but not recklessness.
Now prove that what this woman has done amounts to 'reckless' ! No chance, on what you say ! At worst it sounds like the kind of damage which is entirely incidental to a tenancy. What's more, it would have to be proved that she either did the damage or was part of a joint enterprise, a party, to causing the damage with intent or recklessly.
The police are bound to investigate anything which could be a crime, on a complaint, but they've bailed the parties to see whether what they have is worth pursuing as a criminal matter [They take advice]. As Barmaid says, this looks like a civil matter, but remember the police do have that duty.If it ever got to a charge it would be worthwhile taking jury trial, because juries have common sense and take time to consider.
This wouldn't be the first time that a complainant has involved the police , perhaps to frighten someone or to intimidate others who deal with the complainant, in what is , prima facie, no more than a civil matter, and it won't be the last