So the big problem is that she's been using tap water? This isn't a huge deal, tons of people do it.
Sitting with lights off with no corals. No problem.
No Feeding? No problem.
The biological filtration of the tank will be in a fairly dormant state right now because of the lack of life, but if you take things slow it'll bounce back fast enough. I've left tanks fallow for months without issues.
Sooooo, let's go back to that first question that you seemed to have missed: what are your water parameters? We can give you a game plan if you tell us what we're working with. Without those it's like calling a mechanic and saying"my car is broken. How do I fix it?"... well, what's broken?
I can tell you right off the bat that you should start with a water change (After you test your parameters) and getting a simple clean up crew, etc... almost like you're starting a new tank.
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