Jeanine,
AHAHAHHA!!
Don't wanna scare you but this is pretty normal behavior of siblings,
Which is a GOOD sign,
Friends seem to get along better.than sisters in the earlier years. this was the case with my sister and I. Noe we are best friends.
Its also very normal behavior of a young girl reaching for puberty, my son 11 years old, is driving me crazy, and he is constantly yelling at his brothers. He loses his temper, and doesn't know why. School troubles, Friends calling, wants to be a baby but still wants his independence.
I suggest that you make them join a sport or activity, so that the time they spend is fun time together,
try and do this on a weekend that ISN"T supposed to be DADDY time.
The YMCA is a great place, enroll them in swimming,
PAY FOR BOTH girls to have a membership,
and you could even alternate with your step daughters MOM
letting her drive the girls everyother weekend ( of course this can be discussed prior)
Make sure she spends time with her DADDY with out you and her new sister.
And speak to her mom , I am sure she is dealing with much worse at home, Angry frustrated kids are alot of work,
Incase you and her mom don't get along, Perhaps on the weekends you have her daughter you guys could give her some extra money to get her nails and toes done,
While your at it, you and YOUR little girls could also do this together,
Being trapped in the same house in the middle of winter is hard for kids, they needs something to keep em occupied.
So as frustrating as it may be this is NORMAL for her age.
Wait until PMS hits, then the real trouble starts.LOL
M
Edit:
I just read the others comments and i have to say i disagree
She is OLDER and needs some privlidges diffrent from that of our daughter 8 is still pretty immature,
Also I don't think this is her way of acting OUT because its directed at your daughter and NOT you,
If it was about YOU or her father she would do more mischeivious things and act OUT, sibling rivalry is normal
Name calling is completely normal,
and a whining 8 year old is also normal
PLUS they have both been ONLY CHILDREN for the last few years
And are both used to getting there own way, and not used to having to share personal space and things LONG TERM<
Its diffrent during playdates as its temporary,
Its good that you uy them everything the same, BUT at 10 she wants to pick out her own stuff, and go over friends houses, and have cellphones ect..
IT doesn't mean she gets it, but thats what they want.
My son is 9 years older than his brothers, and they still fight, jealousy, ect.. They are Half brothers but as far as he knows they are full brothers and they love eachother
Your doing everything right, they just need a more structured routine established, the best plan is to enroll them into something Cheerleading, where they have something incommon to WHISPER about, some thing that keeps them busy,
You can't expect them to act like adults cause they are children, the diffrence,
Friends go home, sisters don't
Giving her space is a great idea, but she also needs lots of attention, especially from dad.
So maybe you could plan a special weekend every other month for her and her father- you guys excluded, and dring that time you can have MOMMY and ME time with your little girl, which i would bet is something she really misses aswell.
Good luck,
M