Bit late to the party here, but she clearly has decided she wants something for the business (understandable - whether her valuation is realistic is another matter), and is using bullsh*t excuses to make that happen.
We had a similar-ish experience when we took over our shop. It was being run (I use the term loosely) as a greasy spoon cafe - all of the equipment in there was absolutely knackered, old, the whole place was a mess. We wanted the location but nothing else - we were changing the format completely, plus we planned to completely gut the place and change the layout etc.
We spoke to the woman that had it - she explained that her lease was expiring in a month or so but she was trying to sell "the business" (I mean, she had nothing to sell - some knackered old equipment and she was taking less than £500 a week most weeks). She wanted £7500 ??
We offered her £1000, as much as anything as a bit of goodwill, and just to move things along quickly and a couple of bits of equipment may have come in handy. She refused - her prerogative.
So, we tracked down the landlord. We actually found him as previously he had operated a business from there before retiring and leasing out the shop - we found the limited company details, he lived locally so my business partner actually went and knocked on his door and had a chat with him.
Long story short, we agreed a new lease with him directly as she had failed to do so (in fact she was 4 weeks outside of her lease, not paying any rent but still trying to sell it as a business). We could have turfed her out immediately but we gave her 7 days notice to remove all her stuff.
As you can imagine, she hit the roof, told us "we couldn't do that", went around slagging us off locally saying we'd stolen her business from her etc. I kind of felt sorry for her in a way but she just didn't understand that she didn't have "a business", she had some knackered old equipment in premises that she no longer had a valid lease for .
So, yeah - if your boss wants to play hardball and start demanding things, then unless you really value your friendship and relationship outside of work, play hardball back. There's nothing stopping you agreeing a lease with the landlord if she decides not to renew.