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It was me, not hawkpsd, who asked about the 'princessization' of our glorious womanhood. ;-}
I wasn't offended, just curious that you seemed to think this was an expanding phenomenon. I am 49, so perhaps this is something new. Your anecdote about the birthday party, and the ages of the participants, suggests it might be. But I wonder if the occasional desire to feel special, something I think is common among all humans, really translates into an every day conviction of 'royal privilege' on the part of mature women, which is what your earlier comment seemed to me to imply.
Disney is a corporate enterprise that benefits from children desiring their products. Similarly, the advertising push associated with Valentine's Day has become suffocating. But unless you have some information that shows that these excesses are being created solely (or even largely) by women, then one has to wonder who exactly it is that is responsible for the phenomenon you think you are witnessing.
BTW, the tiara was a gift given with a matching necklace. It would have been rude not to wear it and, since it was quite pretty, I was happy to do so. Being perceived as "royal", however, had nothing to do with it. It was decoration, nothing more.