Thank you for your question. My goal is to provide you with the best possible answer.To achieve that goal it may be that I will find that I need to gather further information from you. As well, it's quite possible that you may feel the need to ask me additional questions for further clarification.But, please understand that as a careful lawyer I will always give you an honest answer even if the answer is sometimes not what you were hoping for.
Do they have children?
Then she is free to leave Canada when she likes.
If she lives in the UK for a year she can get a divorce there.
Or she can first apply for support if she needs spousal support.
She can get the order in Canada and then enforce it from the UK if possible.