The characteristics are the following:
There are two main objectives of each and every seminary girl.
1.To get married to a nice frum YU boy who preferably spent two years at Shaalavim or KBY.
2. After getting married to one of these men she will want to have tons of babies and to raise them as frum Jews while she will be is a housewife.

In order to obtain these two objectives they must go under a radical transformation during their time in Israel. They begin by accepting everything their teachers tell them uncritically and unquestioning as the word of God. They will then begin to change externally first. They will begin to wear only skirts that cover their knees and blouses that cover their elbows, also their clothing will become much more bland and dull.

Following these changes they will begin to cut ties not only with boys, but also with any girl they knew from before, unless they too are undergoing the same change. This process also includes her very own parents. She will not dissolve this relationship, but she will most likely start criticizing her mother for not covering her hair. At this point she will also delete her facebook account and hunt down all photos that she makes an appearance and have them destroyed as well.
Seminary Girl 1 "Did you see what Chaya Esther was wearing?"
Seminary Girl 2 "Yeah, It was disgusting, her blouse only reached her elbows adn there was a picture of a goyish band on the front"
Seminary Girl 3 "But isn't this Loshon Hara?"
Seminary Girl 1 "No, because we are only doing this for her own good"
Seminary Girl 3 "How is this for her own good?"
Seminary Girl 2 "Well hopefully if enough of us start talking about it, she will become so embarrassed that she will change her ways and become a good frum Seminary Girl."
Seminary Girl 3 "What if that's not exactly whats she wants? What if she wants to go on to an Ivy League school and receive a higher education or what if she wants to be intellectually stimulated by her Torah learning?"
Seminary Girl 1 "That's not what she really wants, for we learned that we can only fulfill our divine mission by having lots of babies and therefore the only way we can be fulfilled is by getting married to a nice frum boy who goes to Yeshiva University"
Seminary Girl 2 "It appears that we might have to do a similar intervention for you!"
Seminary Girl 3 "No please don't, I can change, I can become an ignorant frum Jewish housewife also."
by Institute for Jewish Women December 6, 2010
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Second half
Now that these features are taken care of a much more intense process of transformation may occur for the internal aspects of her character. It begins with letting them know their purpose in life is to continue the Jewish people by having big Jewish families. It continues by dumbing them down by only offering the most simplistic forms of the Jewish faith.
The change is done when they begin to make comments like. "Of course the Avos and Imahos kept all of the Torah" "The Gedolim can never be wrong about any matter, for they have Ruach HaKodesh"
by Institute for Jewish Women December 6, 2010
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