About the independent of Albania

First of all, please refer to the map of Europe of the year 1912, it should be found in your text book or somewhere.
Obviously, Serbia was eager to enlarge her influence over the Balkan states and became the leader of the Slavs in the Balkans. Her expansion in the Balkans would definately affact the interest of Austria there. However, compared with other Balkans states, Serbia was too powerful and her expansion seemed to be inevitable. So Austria could only find some way to prevent her to become too powerful to threaten the Austrian influence in the Balkans.
In the Conference of London in May 1913, Albania was first assigned to be ceded to Serbia and it would be the outlet to the Adriana Sea. Serbia was a landlock country, having an outlet to the Adriana Sea would only let her to become more powerful in the Balkans because Serbia could build her navy to challenge the Austrian navy and also Serbia could contact or even receive the aid from Russia to struggle against Austria.
A powerful Serbia would deteriorate the inflence of Austria in the Balkans. The most important, Serbia advocated and encouraged "Greater Serbian Movement" which affect the unity of Austrian Empire. As a result, Austria was 'forced" to protect herself by suggesting an independant Albania to prevent future expansion of Serbia.