Wa ‘Alaykumussalaam wa Rahmatullaahi wa Barakaatuh.
1. A woman will perform I’tikaaf in the place of her house that she has specified for salaah. If there is no such place within her home, she should specify one before she commences her I’tikaaf. An entire big room can not be specified as a place for I’tikaaf, however a small room will be permissible. If the room is big, she may specify an area within the big room that is sufficient for her to comfortably sit, stand and sleep in. (Khawaateen ke Masaa’il Aur unka Hal, pg. 475)
If the bookshelf/cupboard is within that specified area, it would be permissible for her to take things of neccessity from it. However, it is advisable for her to keep aside all the things she would need prior to the I’tikaaf, so as not to waste any time.
2. It is Makrooh (abonimable) to engage in any unneccessary, useless and idle talk while in I’tikaaf. One should try to speak only beneficial things when in It’tikaaf. However, it is also Makrooh to constantly remain silent with the belief that doing so is an act of gaining proximity. (Noorul-Iydhaah)
And Allaah knows best.
A. Z. Pandor