If this is a true/false question, then yes, alienation is definitely a major theme in Modernist literature. They felt like they didn't belong in the society, they were strangers, or aliens, therefore that was an important theme implemented in their literature.
She's graceful and childish. But at the same time, Weena has her own personality. She has retained certain feelings that the other Eloi seem to have lost – gratitude, for instance. After the Time Traveller saves her from drowning, Weena keeps him company and tries to keep him safe and comfortable – in her own way.
It has been a long time since I have read this book but I would say the moral of the Mirror of Erised is to not dwell on the past. To not focus on what you do not have and instead to focus on what you do have and make the most of it. Harry was so intrigued by seeing his family in the mirror that he no longer accepted that he was an orphan and Dum bledore had to put an end to it. Instead of dwelling on desires, make the most of what you already have.
Hope this helps! If you need any more help or further explanation just let me know! :)
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