You may well be right, but it's not just her opinion that matters. Voters are a fickle bunch (even Scottish voters - for every extreme blue faced Nat supporter screaming freedom, there will be a dozen less committed SNP voters who can and will change their vote if the scandal stinks enough), and I imagine if it goes down that road the rest of her party will be counting up the cost and wondering if keeping Wee Nippy in the Wee Hoose is worth it.
I think people are forgetting that Salmond was a bit of **** during his time as FM and the SNP still did OK.
They look to be bullet proof, they dont give a **** about what the English say because it has no effect on them. North of border they still appear to have solid support.