"Fear GD you His consecrated ones for those who fear Him lack nothing (Tehillim 3410) pg 353
Daily Halacha
The custom that women refrain from doing certain types of work on Rosh Chodesh both by day and by night is an age-old custom dating back to the days of Moshe Rabbeinu, which is recorded in the Rishonim and Shulchan Aruch and should be upheld by all girls ad women. Whenever possible, women should not do work on both days of Rosh Chodesh but if one cannot refrain from doing work on both days she should do her work on the first day and refrain from working on the second