Labour would certainly do better in that scenario but 'her' policies would come under far more scrutiny than they did last night. For example, she banged on about the NHS being 100% public sector in Scotland which is an outright lie as several services have been outsourced to private companies under the SNP's watch (indeed, IIRC, it may even be at a greater pace than under the coalition on a per capita comparison). The SNP have also not passed on the full amount of NHS spending increases in England to the NHS in Scotland (as per the 'Barnet Consequentials') so where has that money gone? To subsidise one of their populist giveaway policies one would venture.
Also, she plays the crowd-pleasing/vote-winning "free universities" card at every opportunity yet, as I understand it, this has been at the expense of significantly reduced college places (the figure of 144,000 rings a bell).
Sturgeon had the advantage last night of knowing that her opponents and the TV audience know less about the specifics of devolved Scottish policy than she knows about the policies of the UK wide parties, and she used it to great advantage. Delve beneath the "everything is wonderful in Scotland under the SNP" mantra and you get a politician who is as economical with the truth as any of the others.
Also, the complete lack of irony when she said to Cameron: "Don't act like a petulant schoolchild, threatening to leave if you don't get your way." about his stance with the EU was amusing.