As a mother of a daughter myself I can vouch for the fact that often we moms tend to see our daughters as an extension of ourselves specially when they are young. We wish they would live out some of those unfulfilled ambitions of ours,and consciously or unconsciously tend to push them in that direction. Little do we then realize that our kids, though innocent and easily influenced, are not putty that can be molded into shapes we deem fittest.
With regards to fashion and beauty, again we are prone to dressing them up to look all cute and pretty in a manner primarily appealing to us, hence there may then be adult overtones to their get ups depending on how much restrain we practice.
As seen in the OP some mothers and fathers just don't realize that there is always a time and a place for things in life. In a bid to seeing their daughters in positions of adoration, fame and good fortune, they are making them sacrifice some of the best years of their life ie childhood and forcing them into early adulthood. Unsurprising then to see the number of children and adolescents been plagued by eating disorders, depression,and even substance abuses not to mention getting into romantic and even sexual relationships long before they reach puberty. When an immature being is compelled to lead a mature life no doubt the repercussions will be unpleasant and even destructive.