"How can a Christian woman go this far by getting caught up into pornography?" There are many reasons.
Pornography is a close cousin of voyeurism, where a person derives sexual pleasure by secretly observing the sexual activity of other people.
Pornographic addiction is also different from sexual addiction, where a person is obsessed with sex to the extent that he becomes dysfunctional in other areas of life.
Pornography provides unhealthy sexual experiences that make the person unable to form meaningful relationships with the opposite sex, and therefore remains a sexual cripple.
When you think of the word "pornography," does it conjure up the image of a scruffy guy with messy hair in the basement watching porn in his underpants?
Why wouldn't a Christian run to her Christ and, instead, run into the arms of another lover like pornography? The answer is obvious: She doesn't know Him.