Cancellation of Tier 2 Dependent Visa

I came her last year as Tier 2 and got my wife here this year as Dependent. I have gone through so much physical and mental torture that I have decided not to continue. She is going back to home country to attend a function next month and booked the return ticket only for December. So I have 3 months. I just want to know how can I cancel her visa. Just informing the home office that I dont want to live together works or should I do more than that?
Kindly advise.

Thanks!

Link below. Note that it is not an instant process and the possibility is that she will still be able to return to the UK. If she does, she won't however have a visa route as a dependent. She would only be able to stay if she qualifies for her own visa such as Student visa or Skilled Worker visa.

https://www.gov.uk/visas-when-you-separate-or-divorce

Once you inform UKVI, you will NOT be kept informed of the process. I would suggest you wait until she has left next month and then do it.