IIRC the new Albanian state was very shaky, from foundation through to the war. Perhaps, while the Prince is away in Germany, the government collapses entirely due to internal issues, and Greece and Serbia take the opportunity to revise their borders under the guise of restoring stability. Albanians, though disunited, resist the "peacekeepers" and both Serbia and Greece find themselves bogged down. The Austrians take the opportunity to stir the pot by ensuring weapons flow into the region, and Bulgaria starts getting belligerent about expanding its borders. A Bulgarian attack on Serbia would not draw the same response that an Austrian attack would/did, but there's every chance the Ottomans would get drawn in somehow, which would draw Russia's ire. Britain doesn't want the Ottoman Empire falling unless they're the ones toppling it, and Germany has close economic ties to the Empire, leading them to become involved. The slightest escalation by someone and the whole thing goes up.