I love xenomorphs more than any other living or non living creature on this world, except for Dragons, but like dragons, Celestia is the Sun Incarnate. She could burn away anything in her path if provoked. She has magic, she has the Elements of Harmony. If she were to use them on the Queen, than I... I don't know, maybe the queen will turn into a butterfly or instead chest busters, you got cancer curers or a baby that will come out less painfully. I don't know just... randomly saying shit. Good f*cking art though!
What nobody seems to understand is that they're not even fighting... They're simply having a quiet and completely sensible conversation. In a moment I'm sure they'll both sit down for a few cups of well-made tea and begin diplomatic relations.