2 year old not to fond of belly

i’ve been trying to get my 2 year old to

talk to her brother since i started to show. she just doesn’t like to do it 😂 i’m trying to make it n a way so that they can bond at least before he comes because she is the baby in the family and gets all the love right now. from me on down to the grandparents to the great grandparents. it’s going to be a big shift in her life when the baby comes. i’m not saying she won’t get attention any more but i know for a fact she will be jealous. how can i get her warm to the fact that a baby will be here in 3 weeks.