It's beautiful girls' favourite bag有无语法错误?

It's a beautiful girls' favourite bag
or
It's beautiful girls' favourite bags

有啊，是It's beautiful girl's favourite bag .

It's a beautiful girls' favourite bag

有。因该是：It’s favorite bag for a beautiful gial.

It's beautiful girls' favourite bag
你的意思是一款女生非常喜欢的美丽的包
这样译也许好点：
It's a beautiful bag which girl likes best