People forget that the Confederates were constantly seeking military intervention from Britain and France in order to lift the embargo. They assumed Britain would jump in immediately to continue the hostilties against the US made during the 1812 war and a potential valuable land grab (of what was technically their's in the first place) taking back some of the Northern colonies during Victoria's reign would have been massive for her prestige. And as far as I know the only point of entry and exit out of the South whilst avoiding the blockade was through the Gulf of Mexico and Texas. That being said whilst Victoria detested slavery and did not seek to support the confederates directly, Britain still relied on Southern Cotton and supplied the Confederates with a number of Clyde-made frigates to purpose as blockade runners, and not to mention supply 1,000,000 British enfield rifles.