Daughter obsessed with unicorns and rainbows
We're two dads. Daughter is 4, almost 5. She's a very girly girl, which is surprising because we never "gendered the baby." She's obsessed with stereotypically little girl things. I find it annoying, but I try not to show it. For instance, she won't wear any clothes unless they're "pretty," which means pink, pink, pink, maybe purple, unicorns, rainbows, clouds, glitter, ice cream, flowers and butterflies. Lots of tantrums if it is anything else. Ask her what she likes, what she knows a lot about, what she wants for her birthday, what she dreams about, and it's always the same answer: rainbows and unicorns. We have lots of those things decorating her room and school supplies, but I find it cliche, frivolous and unimaginative.
In contrast, her boy cousin (7 yo) is equally obsessed with trains and cars. At least cars actually exist, there are mechanics and engineering, even career options. He can recite brands, models, specifications, statistics, prices, etc. We adults all tire of it too, but at least it has depth and is semi-useful. How far can you really take unicorns and rainbows?
My question: what becomes of little girls like mine? Should I try to get her interested in something else or is it futile? If this is a phase, when will she grow out of it? Thank you.