It’s a genuine error and the way the system works in strata is that if you breach a by-law, you get a Notice To Comply (with the by-laws). You then choose whether or not to do that. Any reasonable person would do so and that is the end of it.
The only subsequent action may be if there is damage to common property and she would just pay for the repairs.
There are no StrataKops and there is no penalty for an honest mistake unless she refuses to remedy it when asked to do so.
Her only real issue is if she wants to keep the air-con and the strata committee or owners corp don’t want her to.
Personally, I would wait for someone to complain and then deal with it as amicably and efficiently as possible.