Labour in Scotland keep maximum hostility up with the SNP as they're so worried about optics around working with a pro-independence party. Look at what the Conservatives did to Ed Milliband with SNP propaganda.
Basically, the SNP are "toxic by association" for any party as the Tories will go for the jugular at the notion of any alliance with a party that challenges the UK union. Dugdale is a poor imitation of Davidson on that front. She may have some more morals intact, but she often tries to outdo Davidson which is impossible. The Unionist vote in Scotland is going Conservative. The only direction people are flowing is from Labour to Conservative.
However, in saying that, I still believe some who voted NO in 2014 who were possibly Labour voters voted SNP in 2015 based on policy. Those people may be likely to switch back to Labour now as they prioritise the Union over a threat of Scottish Independence. By in large though the swings in Scotland will be towards the Tories.