Awww, she's so cute. Has she settled in yet?
Haha, no way.. she's as stubborn as her brother and every time their gazes meet, it's on for young and old. It's not getting to violence, just very loud grumbling and a bit of hissing. However, she's been exploring the house a lot more lately, and she'll gladly go up to the room with the litter trays and do her thing by herself.
Shadow (the lilac sook in my avatar) is being awesome. He's progressively been getting closer and closer to Bronte so she'll get used to him pretty soon. I've no doubt that he'll be the one to hold it all together. Left to their own devices, it'll take months for the two siblings to come to terms with the situation.
We just have to remember that her world has been turned upside down, and she is 15 months old so the adjustment period will take a lot longer than it would for a kitten. She's getting really smoochy with us though, which is fantastic... she's a really sweet little cat.