Not that it's a good answer, but did the lasix increase her UO? If so, then it was the right choice for her.
I look at your patient Ike this...she was severely hypotension in OR. Kidneys are the most susceptible organ to hypoperfusion. Her kidneys took a hit during that. AND, not only did she have poor perfusion, but her hemoglobin was also probably low after the EBL of 4500 (holy crap) leading to poor oxygen delivery to her kidneys. Now you've hit 2/3 things that lead to organ damage. If she had any oxygenation issues, you'd hit a 3rd. Once damaged, sometimes the kidneys take a few to reflect the damage and no matter what you do, the kidneys need to heal and the only thing you can do is maintain good perfusion, oxygenation, and O2 delivery (hgb), and play the waiting game. Lasix is good for vascular volume overload as you know, which it appears this patient may have developed given the high CVP. I'd assume they would also check her I&Os (she has gotten like 15 blood products and has damaged kidneys so I would assume she'd be positive). So yeah, Lasix doesn't sound like a bad idea although it's not going to do much for the kidneys.