Honestly it sounds like she is delaying in order to screw someone- the insurance company or the property owner- out of $$. She will be able to claim she lost revenue and had other damages during this period of mold mitigation or whatever and will have a strong enough case that someone is going to end up paying her.

Environmental Scientist, who get paid, should be held with a lot of skepticism and the property owner and insurance companies BOTH should have their own experts in for evaluation. There are LOTS of different kinds of mold, and most of them are not dangerous to us humans.

Not telling you what to do, but if this were happening in my building (and it could) I would
a> hire an outside mold expert and get the real skinny. Make SURE you hire the one who has the best reputation and the most to lose if they make a wrong diagnosis.
b>send the wench a formal letter stating that due to her interference repairs are not being made in a timely manner and its costing you damages, which you will seek to recover if things are not expedited accordingly. Not having HVAC can aggravate many things, including affecting your customer relations. Have your attorney draft it.
c>Contact the property owner and see where they stand. If they arent with you then you NEED to make sure you talk to your legal counsel every step of the way. Remember this is your livelihood, and inconvenience is one thing, loss of revenue another.