thought acquaintance photographer was doing shoot for free, then she sprung huge fee after

My business partner met a professional photographer who is a friend of a friend and she expressed a lot of interest in shooting something for the new business we are starting; it's very visual and artistic and unique. I was not part of any of the discussion, but my partner made it clear we were starting out and had no money. She continued to say she wanted to shoot it and we thought she wanted do get involved in this venture and maybe add it to her portfolio. She put in a lot of work, but never discussed a contract, a fee, or what we needed out of the shoot. Once it was all done, she presented something that did not fit our needs and told us her fee was in the 5 figure range. We were shocked. We have offered something much lower, as there are some aspects we could use, but much of it is not of use to us. She's of course very unhappy .

I don't think we owe her anything, and I don't mind walking away from it. But I also don't want to be a complete asshole. I don't mind paying a fraction of her asking price for the raw images, and in consideration of all of the time she put in. I also acknowledge we should have clarified this upfront, but that was also really her responsibility.

Any suggestions on how best to handle this?

Edit: Not being a photographer, I forgot that RAW is a specific thing. I meant unedited (in particular some videos) files.