I’m guessing, given your legal expenses etc, that you have squeezed other spending as far as you can without damaging the value of the property.
So put together a spreadsheet of all her complaints and how much it will cost to fix them, then add in all the existing costs of running the building and show her how much more in levies she will be paying if you accede to her demands.
Ask her which of the existing services she wants to remove in order to reduce her levies.
I’ll bet my bottom dollar the first thing she’ll pick on is the Strata Management fees. Many owners think that all the money paid to the SM goes straight into their pockets. In fact, most of it goes to pay bills that they take care of on your behalf. I wonder if any of it is set against annoying phone calls from ill-informed owners.
There is one other issue – when you buy a property, the levies are right there on the ad and in the literature handed out. If she didn’t want to pay the levies, she should have found somewhere cheaper.
Getting her on the EC may be a good idea – unless she is just one of these people who isn’t happy unless they have something to complain about.