Child using the word HATE

Chi

Hi so recently my almost 5 year old has been using the words “I hate you” when she’s upset. And it’s almost gotten out of hand. We were just a friends birthday party that she was invited to. When all the children went down to play the birthday girl game upstairs crying bc my child told her “it’s not your birthday and I hate you” she’s been doing this out of anger and we don’t ever tell her we hate her so I’m not sure where this is steaming from. Is anyone else dealing w this ?