Fair enough on Sara's part. Still, even on TV Sara's freakout was arguably much worse than Jaime's, and she seemed shocked at her inability to stop herself. I've got a backstory thing planned for her, though, to address this.
As for surgery time, this is another future plot point. The system wasn't anywhere near complete when Jaime woke up, and it's still not. Surgery was mostly about attaching pre-made parts to the remains of Jaime's body, then putting the anthrocytes on the job to start stitching everything together. If reading this makes you ponder the implications of a) having parts in storage that fit Jaime and b) a nanotech-based system that is designed to repair damage to her body by all means necessary, rest assured that this will be dealt with. I fully admit that the overall time spent in actual surgery is for story convenience, though.
As for the cost, that's actually up from the TV series, which quoted 50 million dollars. It's still pretty random, yeah.