Hon I hate to be a nitpick but that's an entirely different dress :P
Not that she's not the same doll, she's obviously a Daisy :)
No - Daisy is a lot smaller than Barbie - I think she is 9" - I had one recently that was smaller. Her outfits were advertised as being designed by Mary Quant and she had LOADS - also furniture, a horse and everything else. She also came with brunette hair and these are much rarer. There is a 'Daisy Long Legs' who is 15".
They aren't generally worth a lot - but some are, especially boxed. With many of those 70's outfits the fabric seemed to be shared about - sometimes used on Pippa, Action Girl, Daisy or even Sindy.
I've never collected Daisy, I come across them fairly regularly at but always sell them fairly quickly. There are some real Daisy fanatics here in UK!
( There was also a very pretty doll 'Havoc' who used the Daisy molds, but had short chestnut hair and was a 'secret agent')