I need help!!!

I am 2 weeks into 2under2. My oldest is 15months old. No matter how much attention I give my oldest, any time i need to care for new baby (feed/change) she stands in front of me screaming and crying- unless there is another person -who she wants to play with (grandma/ other kids)-present (other than their father). Im a sahm so i have unlimited time devoted to my toddler. I dont even get to hold the baby unless im feeding and burping her. I understand the jealousy, I let it go the first week bc its a big change but have slowly began to try to correct it- nothing I do works. She absolutely loves her sister and “helps” me care for her at times. I just dont know what to do to get her to stop screaming at me for taking care of the baby.