Yes this highlights the ridiculous nonsence of "Devolved Parliaments".
However, without ranting on, I believe Ms Sturgeon's angle is that the Scottish Parliament has discretion when implementing EU law pertaining to matters devolved to them. She has sought to extend this to UK law (which is what will have to be repealed/amended to effect Brexit).
I know it's early days and disappointment is widespread, but I really don't understand why the result cannot be accepted. None of this would have arisen had the vote been to Remain. There were never any caveats or opt-outs mentioned in the campaign (though Ms S. did mention her independence plans, which was right and proper). This suggestion, however misguided, is not right and proper. It was a UK referendum; Scotland voted only two years ago to remain part of the UK (which was a choice never givern to the English). They need to dry their eyes and move on instead of behaving like spoilt children.