Actually, whether she wears a blusher or not does impact the wearing of a tiara, eg.
Diana wore the Spencer Tiara on the outside of the veil and blusher which I have never seen before or since:
https://i.pinimg.com/736x/7c/c1/cc/7...na-spencer.jpg
The upside of this was we all got to see the tiara sparkle up the aisle and reflect off the crystals scattered over her veil. The downside was that she had to keep the blusher down until they went into the Vestry to sign the register. There it was simply cut off with scissors.
My own preference for a second wedding is no blusher.
Catherine's blusher was attached to the veil itself which meant that all the way up the aisle the tiara was covered and the density of the blusher blurred her tiara preventing us from getting a really good look at the Halo Scroll.
https://i.pinimg.com/736x/7c/c1/cc/7...na-spencer.jpg
Unfortunately, the density of the veil was doubled when her blusher was thrown back and the tiara was set below the slightly bouffant hairstyle which meant it made the tiara even harder to pick out against the double white veil.
https://vg-images.condecdn.net/image...MQLoz/crop/405