The "plough on regardless" advice was on 17th, 2 days before the commission & diligence process started & was perhaps the point where the ministerial code really should have kicked in, in earnest - not least given the absolutely ridiculous cost involved in that one action alone. The advice was targeted to the law officers specifically to try and get them to get the FM & her government to see sense. But they allowed that to go ahead knowing their case was absolutely screwed & had been for some time.
This is I think where the committee can absolutely nail her on the ministerial code breach, and I'd also expect the separate ministerial code investigation to cover that as well. She signed off on a pointless exercise costing £££££s which could have been avoided. On that basis alone, she should resign.