Foreigners often make some strange mistakes in Chinese when they study the most difficult language--- ---Chinese. We try to analyze typical sentences to correct these errors.
Tā yǐjīnɡ bìyè dàxué le.
False: 她已经毕业大学了。
Tā yǐjīnɡ dàxué bìyè le.
True: 她已经大学毕业了。
“毕业”本身已有一个直接宾语，如果要指明毕业的学校，则应把“大学”移到谓语“毕业”之前，做状语。
毕业 already contains a direct object, and can not be followed by another object. 大学 must be placed in front of the predicate 毕业 as an adverbial adjunct to show the place of graduation.
