So, why would she expect to be accepted when she changes into more human form? It would always need to be done in secret and in the face of opposition. She can't take anything for granted, not in this situation.
When Delenn emerges from her cocoon all scaly and lizard-like, neither she nor Lennier are sure if this is what was supposed to happen. (When Franklin asks her, Delenn says, "I do not know." She also asks him, "What am I?") Certainly Delenn, being Delenn, would have done a far better job of researching Human physiology if she had known going in that she was going to become partly or mostly human. (So that haircare would have been less of a mystery to her, not to mention the "odd cramps" she later asks Ivanova about.

Delenn didn't expect opposition because she didn't really know what she was about to do. She only knew that she might be making a great and terrible sacrifice for her people, and that it was necessary. For the rest she was willing to let prophecy attend to itself.
Regards,
Joe
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