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I felt the same honestly. I thought it's only my imagination, but now that you mentioned it... her hair looked very strange and Suigi-sama also remarked something about it, so I am really scared for the end (I just think on how Reimei nò Arkana and Loki ended up since we are talking about the same author ;;;;; )
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Okay, yes. It is definitely the hair that threw me off
Just to confirm it, here's the difference
From:
http://www.mangago.zone/read-manga/suijin_no_hanayome/nbt/d_v-7-chapter-25/pg-4/
To:
http://www.mangago.zone/read-manga/suijin_no_hanayome/nbt/to_v-7-chapter-28/pg-18/
So... Did she age from moving between time periods or did the art change?
Or am I imagining it and she looks the same?