Why would a potential buyer act like this?

I listed a property for sale in fall of 2024. Despite a price drop, zero offers. I took it off the market in January 2025 and offered it for rent through a property manager who told me that the renter she selected had wanted to buy it. But the renter never made an offer. Months go by with the tenant living there with no problem. The Renter approaches us directly in fall of 2025 about buying the place. But she has no offer in mind. She asked what price I wanted, I named a number and she said "I can do that".

I get a message the next week asking for a $30K price reduction after having spoken with her realtor and financial planner. I say yes. But now I learn that she can't close for 90-120 days as she needs time to sell her place (note that typical escrow here is 30-60 days). We say we can't do that but keep the lines of communication open. She offers to put half of the asking price down but tells us that she will need her rent cut in half to "reimburse her for having her money out of the market for so long". I say what about our opportunity cost for not being able to get our money in the market. She backs off but then asks again for this in writing and also asked for another $100K price reduction.

After five weeks of this nonsense (note it is possible to do a 30 day close), we tell her 3-4 months escrow, a rent reduction in half and a $100K price reduction is not acceptable. Still she makes no concession. We have the agent give her notice to vacate. She does and I list the property immediately.

I told my listing agent that we really don't want to deal with her, that she is a dithering flake making ridiculous requests. Two months go by, she doesn't make an offer though we hear that she still wants to buy it.

We drop the price slightly and get an offer immediately form someone else. Renter gets wind of this and guess what? She sends a backup offer with a personal message to us "I really hope I get it" through a real estate agent, for the full reduced price which is alot more than the $100K price reduction she asked for, all cash, an AS-IS addendum and a 30 day close. Oh, and by the way her offer is accompanied by financial statements which prove that she had the cash all along.

The first offer closes so we didn't have to sell to her. But I just can't get my head around what she was playing at. Any ideas?