What are the chances of lifting an immigration ban drug case?

Good morning.

My wife is Philippino national and I am a UK national working in Dubai.

In March 2016, my wife was arrested and charged with the Abuse of Psychotropic Substances. She was sentenced to 1 year in jail.

After 6 months she was deported back to the Philippines (September 2016) and is now on the immigration blacklist, I have had this confirmed. At that time she was single, we met later.

I understand it is legally possible to get her name removed from the immigration blacklist, but my question is have the UAE courts ever lifted an immigration ban for someone jailed for a drug offense?

I understand the law is rarely ‘black and white’ but would appreciate a legal view.

Obviously, I would like my wife to join me here in Dubai and I’m just trying to understand if this is actually feasible or we should just accept that we will have to live apart while I work in the UAE.