What do you do when you have a friend that tries to be like you?

So this girl (my so called friend) like tries to be like me and all my other friends admit it... Today in first period i had my bronzer on my lap and i totally for got i had it their and i got up and it fell off and broke everywhere... my and my bestfriend always make funny comments about her cause of the fact that she tries to be like me and she lies A LOT! So i said watch valerie is going to say she broke hers too >.< ... so inbetween break i had told her omg my bronzer broke and she was like mineeee tooo and i just started cracking up and i said ohh let me see and she didnt want to show me..? im also the type of girl that looks like one of those little raver chick i guess you can call them and i have black hair with a little bit of blond in it 2 days after i got it she had it ...i shade in my eveybrow as well and shr started to do it so what i did was take out my blond and not shade in my eyebrows and 1 week later she did the same.. what do i do?