while the characters are women, I don't think it fits the spirit of the child's request. Xenon and BoP are sexy robots made to be alluring to a hetereosexual male audience, and I think that's fairly obvious. They were the Woah Nellie of their day, going for that teenage boy titillation.

Lord of the Rings has Eowyn, "I am no man".

Arwen, "If you want him, come and claim him":

I second the recommendation for Avengers. It has a number of female heroes and a property that is current and that all kids will know.

Tron has Quorra and Gem.

Magna Matra is indeed a powerful female character; only thing is in this game she's the villain, not a good character, and you eventually kill her off rather brutally at the end.

Jurassic Park….Remember what doctor Wu said, all the dinosaurs are female…
Kidding aside as a father of 2 girls 4 and 8 I am mindful what games go in my basement. My 8 year old plays a lot of pinball, her favorites of mine are Jurassic Park, Comet, The Simpsons and Hook, she doesn’t really play Lethal Weapon 3 at all but when I play she likes to be in charge of pulling the trigger during the shootout and cut scenes.
On location she loves Guardians of the Galaxy which might be our next game. I would like her to play Avatar and see what she thinks as she likes the movie and the Avatar themed land in Animal Kingdom.

Rollergames

WPT and TOTAN are decent examples.

Dorothy in WOZ is a murderer and druggy.

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Wow lots of bad answers in here

Anyhow, my wife had me put our Dolly Parton and Fire Queen in our living room. She loves those games and the art on them.

When I've wheeled it into tournaments, I've heard women squeal in joy at the sight of Dolly. I can't bring myself to point out Dave Christensen's cheeky joke in the art on Dolly. (Look closely at the pink flames on top of her head)

Fire Queen is gorgeous and it strikes the right balance of a power and sexuality in my opinion.

I have a Catwoman version of Batman 66 that does well on location. The art is sorta whatever, but it's what the location wanted and the female bartenders love it.

TNA or Lexi Lightspeed are probably the best answers though

The clairvoyant means business..

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Avatar.

Add that to the list of links I wish I never clicked on lol...

To the topic at hand, I haven't played the variety of pins yet most other posters here have, but my vote would be for Stranger Things. It seems to hit a lot of your points. Strong, (and young) female protagonist; not over-sexualized and all around pretty family friendly; and as an additional bonus it's fairly highly rated pin that you can currently add to your collection pretty easily.

I also may be biased because I love STh, to the point I went to a Halloween party as Eleven when the show first came out. The wife was NOT happy to come home and find that I had shaved my entire head and beard off for the true effect lol.