I'm not sure what you mean by wanting the name to be "the same as her sisters". Something that sounds similar? Has the same meaning? Rhymes?
You could do Ronan, which has a similar beginning and ending, nickname Roni (or Ronnie). It's technically a boy's name, but so is Rowan, and I'm sure both can work for girls.
If you want a similar meaning (red), you could do Ruby, Garnet (nickname Nettie?), or Sienna (nickname Sie/see).
If you want rhyming, Cowan/Cowen (nickname Winnie).
Re: Twin girls - HELP
You could do Ronan, which has a similar beginning and ending, nickname Roni (or Ronnie). It's technically a boy's name, but so is Rowan, and I'm sure both can work for girls.
If you want a similar meaning (red), you could do Ruby, Garnet (nickname Nettie?), or Sienna (nickname Sie/see).
If you want rhyming, Cowan/Cowen (nickname Winnie).
Callie
Reese
Francesca "Frannie"/"Frankie"
Jacqueline "Jackie"
Nellie
margaret - Molly
Evelyn “Evie”
Teagan
But if you need one more from me, then it's the name Juliet and you can Julie.
Emmi - Rosie - Julie