Gender disappointment …but for the sibling 🥺

I’m having a boy! I’m so excited… my daughter on the other hand (8) has her heart set on a girl and has already expressed how upset she’s going to be if it’s a boy… she really wants a gender reveal party to find out so that’s what we’ve been planning for (I wasn’t supposed to know I found out on accident). I want her to have as much fun with all the pregnancy stuff as she can so she feels included and a part of it especially since it may be her only sibling. I just know how upset she’s going to be when blue pops out instead of pink… I don’t know exactly how she’ll react but I know it’ll either be tears or anger or a meltdown or completely shutting down and running away or all of the above. And she’s allowed to feel this way. I totally understand. But at the same time I obviously want her to be happy and have fun at the party she has been wanting so badly and I want her to be excited about her new baby sibling even though it’s a boy. Has anyone else experienced this? How can I help her cope with the disappointment and how can I help her get excited about her baby brother?