Why is rosalie so obssessed with Renesmee

because she really wanted a baby and since bella had one she thought they could share

Rosalie is obsessed with nessie because like she کہا in Eclipse is that when she was human she always wanted to have children so in Breaking Dawn she was obsessed with nessie cause it was like she was her kid she pictured nessie مزید as a daughter than a neice. I دل jacob too!!!!

because she loves edward as a brother and hates bella as a sister-in-law and loves nessie like her own

She couldn't have a child of her own, so of course she would want Nessie as a child. Rose would make a better mother anyway. I know she wouldn't let her daugter be taken سے طرف کی some جھولا, پنگورا robbing dog. I still can't get over how sick that actually is.

Because Rosalie really wanted a child when she was a human so Renesmee is her only way of getting to a baby that she can love like a daughter.