wedding attendance dress for DD10

[chewybacca]

We need a dress for my DD10, she is not particularly into dresses. I am finding nothing suitable. Either very pale colours or styles that seem too old ( off the shoulder, strapless etc)
I don't know where to look. She likes 50's style but in bright colours.
Any ideas?
Budget less than £100 ( DH would like it far lower...)
Thanks

might she like this?
this?

more what you meant?
too much dark with the bright?
teeny polka dots
better?

The polka dot red one meets with approval! Sadly I'm not sure the 9-10 will fit as she is quite tall. Might be worth a trip to town though.
Thank you.

John Lewis is normally a good bet. How about this:
www.johnlewis.com/john-lewis-girls'-embroidered-prom-dress-pink/p2431138

Is this one too dark?
www.johnlewis.com/john-lewis-girls'-floral-print-peter-pan-collar-dress-navy/p2309455

This one is probably too pale - but it's a parrot print!
www.johnlewis.com/john-lewis-girls'-parrot-print-prom-dress-multi/p2539727

I really like the pink one! DD does not! Arghhhh. this is going to cause headaches!

How about Monsoon? Lots of pretty dresses. Here are just a few examples.
uk.monsoon.co.uk/view/product/uk_catalog/mon_3,mon_3.30,mon_3.3.1/9143990225

uk.monsoon.co.uk/view/product/uk_catalog/mon_3,mon_3.3,mon_3.3.3/9150231408

uk.monsoon.co.uk/view/product/uk_catalog/mon_3,mon_3.30,mon_3.3.1/9140682908

Any of these?
http://www.lindybop.co.uk/kids-c17/girls-dresses-c34