The woman servant is the lower ranking princess. The queen is no servant. Hecks no. Just the princess, because she's a servant to what her parents tell her to do.
The princess goes on to do whatever she wants. She tells the real servants, "Don't tell my daddy, the king, I did this. He may (ひめ) not like it."
Currently there are no similar looking kanji which exist in the WaniKani learning system