Not Europe. The only country diplomatically involved within the conflict was Britain. It stayed pretty neutral, though it might have favored Mexico for a few reasons.
For one, Britain was having a border dispute over the Oregon territory with the US at the time. It would not have led to war, but it was enough to fuel minor resentment.
At the same time the US was seen as a growing rival. The current administration, under Polk, was also responsible for fueling anti-British sentiment (mostly due to the border dispute).
Mexico on the other hand, was very week. But do to its size, and strategic location, had the potential to provide a way to balance things out in North America at best or a handy protectorate at worst.
Also, worth mentioning that the British ambassador in the US, Richard Pakenham, had previously been ambassador in Mexico and had a pretty good relationship with a few folks in Santa Anna's goverment.
Everyone else in Europe didn't really care. The Spanish ambassador in Washington, Jose de Atocha, supposedly did negotiate a few back hand deals between Polk and Santa Anna. But my sources on that are somewhat questionable.