"The Basque Country and Catalonia are part of countries who want to remain in the EU"
Yes, but they seek independence from their parent nation (and hence face expulsion from the EU in the event of their success) in just the same way as Mrs Murrell does for Scotland.
The Spanish Secretary of State to the European Union, Jorge Toledo, is on record as saying "if the United Kingdom leaves the single market then the whole United Kingdom leaves the single market". The Spanish Prime Minister, Mariano Rajoy has told the EU categorically that Spain would block any independent and separate deal put forward by Sturgeon [Mrs Murrell] and the Scottish Government.
So that largely seems to be that and the Scottish Parliament would do well to refuse to finance any further EasyJet flights for their First Minister to travel to Brussels to discuss this matter. She could then concentrate on more pressing matters (that are within her Bailiwick) that need her attention at home.