Brian Taylor's take on the matter:
LINK.
Sturgeon has two problems:
1. The polls don't show any significant shift towards independence in Scotland. Yet. I would say most people are taking a wait-and-see approach.
2. This is probably her biggest concern - internal party tensions between the Gradualists, like her, and the Radicalists, like Salmond. Note that the Gradual/Radical wings within the SNP don't corrolate strictly along Right/Left lines.
At the end of the day, any IndyRef2 would require authorisation by Westminster as the constitution is a reserved matter.
Mike.