The Megillas Sesarim’s opinion is that these maidservants were Jewish. After all, the previous queen had Jewish maidservants (as we saw before), as well, so there would be little suspicion. This was “fitting for” Esther because she was surrounded by people with whom she could relate and whom she could trust. Rabbi Mendel Weinbach adds that they could even share food with her. Perhaps it was also fitting for her because she could fulfill the mitzvah of “ve’ahavta larey’acha kamocha” (“loving your fellow as yourself”) (Vayikra 19:18) by treating them well.
The Talmud (Megillah 13a) tells us that Esther requested Heigai to give her seven maidservants to help her count the days of the week for her to know which day was Shabbos.1
Rabbi Yehonasan Eibshutz asks why a person would need other people to count the days. He answers that Esther, although she was hiding her Jewish identity, was still practicing Jewish law. Therefore, if all of her maidservants saw her every day, they would see that she was behaving differently on the Sabbath, and that would give away her secret. On the other hand, she could not treat every day as a rest day, but had to stay active to keep from going crazy.
Perhaps another reason why Esther felt she had to maintain an active lifestyle during the week is based on Rav Elie Munk’s interpretation in Call of the Torah on the verse (Shemos 20:9) that tells us “to work” during the six days preceding Shabbos. Rav Munk says that, just as there is a law forbidding work on Shabbos, we have a similar responsibility to work when it is not Shabbos. Therefore, having one maidservant per day, her maids every week from Sunday through Friday saw her active, and must have figured she was some sort of activist queen. Her weekly Shabbos maid saw her lazing about, and probably figured that she was as idle as most normal members of the noble class.
Parenthetically, the Rokeach points out that the last letter of “v’eis” (suf) and the first two letters of “sheva” (shin and beiz) spell the letters of Shabbos. Also, the gematria of “hana’aros hari’uyos” (“fitting maidservants”) is the same as “zu haysa moneh bahen Shabbos” (“this is she counted Shabbos using them”).
Another interpretation of the Talmud is that she used these maidservant to keep track of each of the days of the Shabbos, the week. After all, every day is special. As we say in the morning prayer service before the weekday psalm of Sunday, “today is the first day of the Shabbos,” and on Monday, “today is the second day of the Shabbos,” etc. We make the most out of every day.
1Presumably the Persian calendar did not have seven-day weeks, or Esther would not have needed this kind of help. There are various calendars, like the Celts, the Igbo, and the Akan, that had weeks composed of various amounts of days. Ancient Egypt even had a ten-day week.