No bother, facts are fairly rare in this discussion
It was made clear to Sturgeon by the EU, before 2014, that if they left the member UK, they would have to apply to join, with all associated delays (EU works verrrryyyy slowly). Spain also made it clear that they would veto Scotland, due to their own regional issues.
It is really much more complicated than, as usual, the Politicians make out. What Scotland remembers, and I have seen with my own eyes over 55 years of visiting the Highlands, is that EU money spent on Infrastructure totally transformed the area and average wage, quality of housing, etc, etc. Now, that could have been done by Westminster, but they never did. Considering the amount that the North Sea oil fields were pumping into the Exchequer in the 70's to 00's, it was a pretty poor show. I have seen no evidence at all, now energy is providing far less revenue, that there can be any decent fiscal plan for an independent Scotland, possibly until renewables become big enough to export large amounts of electricity.