Influence Of Friends And Their Accessories On My Kid

My daughter - say 'A'
Kid #1 : My daughter's close friend, say name X has all the fancy accessories on earth.
My daughter is copying her.
So if he has some pink sparkly different sort of headband, next time we are in store, she sees that, she wants same. She has some fancy toy, same...Now she has pink riding toys, she wants same. If she has pink training wheels, she wants wheels too. She has helmet, she wants helmet too...

In the beginning, we used to buy her same or whatever we want. She was little. But now i am getting irritated. On Some things i feel waste for spending money. And for some things, i just do not want her to copy even if it is reasonable. Like for some thing, i might have bought already some blue shade, can not return, but A saw pink color with X with some more fancy stuff on it, so she asks daddy for same. What do i do with one i already bought?
"How do i train her or teach her these things?"
My daughter has good bike. But she saw X with sparkly pink bike + other pink accessories on it, now she demands new pink bike. She does not even know ride or does not even want to learn.
"Is she copying good manners or good eating habits, no?"

When doing studies, i tell her this kid knows this, X keeps room clean etc, then she says - I do not need to be same, i am different person.

Then lets say we are at home or somewhere where i am serving them. I am bringing 2 cups of water - pink and yellow. Before other kid X finishes her sentence 'i want pink cup', my kiddo just grabs pink cup from me, and sips from it because she wants it too.
So she is very grabby/snatchy at home and with this close friend ( but in our home with me), Outside with other kids, she gets downplayed.

Kid#2: Other friends - say Y is very strong personality.
When they are playing, i ask my kiddo something, Y answers it. No we do not want to do this, we do not want to play here,...there, we do not want to play with this kid, ...there can be lies too, some other kid he is mean to us etc, she will try to send other kid back, so they can only play.. etc etc. My kid gets totally swooned over when she comes or she goes and does what she says like a teacher.
However, when i ask if she wants to play with her, she says no strongly. She is getting intimidated and does not want to play with her at all. I asked her you can not. You need to learn to face it and tackle but no.
Y sometimes tell her (A) - she does her on face, she does not like playing with her.. She does not want A to play with this kid etc. Then she kind of tease her with some craft stuff...
So A feels too much and can not take it.
Thing is Y is also a kid and does not know what not to say. She just speaks what's in her mind. Her mother also told us once that she does not see surroundings when saying something.
Mom and I are close friends. She calls for play dates. Its hard to say no.

 

yes my kids and friends are 7+. Kid#2 - Y Dominating kid's mother asks for play dates and i ask my daughter. She gets aggressive and loud that she does not want to play with her.
When she somehow comes on door ( like I say ,okay please send her, without listening to my kiddo) , She of course plays happily with her but again next time, will do same. And will tell me reasons.
So yes she is getting dominated or kid of pressurized or do things she does not probably want to do.
That kids mother did say that their kid Y is mature and loud and does not think and thus run into problems. But I never mentioned about issues my kid is having with her. I do not know how do deal with it, Should i avoid play dates ? They hardly play 1/week. And that too her mother asks, I have to say no....how?
I ask them to play in our house for many reasons and my kiddo does not want to go anymore. So sometimes other kids come and many times not. but then kids do not go outside at all as they want to play tea set etc all girls stuff.
Infact kid#2, Y kind of asks to play inside.

 

Thanks @DDream.
Sometimes we just need someone to hold the mirror for us.
Many times, i kind of forcibly set the play date that anyways she gets excited when he friend come and starts play and follow her like a puppy.
It is only after she is gone or later day or asking her for next time, she shows resentment...that she does this that....small small stuff. Also i want her to be able to deal with little dominant kids. She can not always run away for situations.