No, I’ve made up my mind about it; if I’m Mabel, I’ll stay down here! It’ll be no use their putting their heads down and saying “Come up again, dear!” I shall only look up and say “Who am I then? Tell me that first, and then, if I like being that person, I’ll come up: if not, I’ll stay down here till I’m somebody else”—but, oh dear!’ cried Alice, with a sudden burst of tears, ‘I do wish they would put their heads down! I am so very tired of being all alone here!’
This passage gives us the idea that maybe that everyone around her has a different head space. Also the thought that people heads have to look down at her not just because she small but because shes a child and her thought process is different between adult and child.