I think this story has potential. It'll be interesting to see how this relationship between three people will end up working out.

I do have some criticisms though. I think the beginning and the second part are set up well in relation to each other. I thought that in the beginning, the two sisters would hate each other since you only pointed out their differences. So when I read that they're best friends, I was kind of surprised and confused. Also, I would advise against just having a huge block of description like you did since most of it you were telling it to the reader. Personality characteristics should come out in your writing through dialogue and actions. Physical stuff is fine to tell but not personality. Throughout the chapter, you did a lot of telling.

I hope you develop Helena's character more. She has a big chip on her shoulder and I hope it's really explored otherwise she's not going to be a character to root for.

A great start - I can't wait to read more. :-)