Workplace Dilemma

My co-worker is driving me nuts!!!!!  I work in a small law firm as a legal secretary.  When I started working there the women who had worked there before me had been there for ages.  The particular lady I am about to vent about has worked there 30 years!  The lack of professionalism in this office was the first thing I noticed having come from a VERY professinal environment.  I tried to fit in and not make waves since this is a GOOD job and being a single Mom I need to hang onto it.  They are very kid friendly and I have a lot of leeway...they let me stay home with my kids when they are sick or pick them up from dance lessons etc.  But this woman is gonna kill me...I don't even know how to describe it.  Well, she comes from a family of ten and has three children of her own.  The sun sets and rises on her family.  And how do I know you ask me?  Because I never hear the end of it.  I know what her 20-year-old son has for supper, what his grades are, what he is passing and failing in College.  I know her 24 year old just bought a new house and every stage of his 2-year-old's life.  I know her daughter just got pregnant and that will be the new subject of updates every morning.  Not only does she tell me everything that goes on in her private life I hear it about 5 or 6 times a day as I sit right beside her (and believe me she does not have a quiet voice) while she tells her million sisters and brothers the same story she told me that mornign (some great saga about one of her wonderful children or grandchild) and then our other co-workers and then her boss and then the UPS man if he will listen.  She spends more than half the day on the phone with her already grown children (who call contantly with questions like ... can you go make me a doctor's appointment or did you put that money in my bank account or can you do this for me? Do you know where my blue shirt is?  What are we having for dinner?) and various relatives and friends she calls and who call her(by the way these are calls that I have to answer).  I like this lady alright but I'm can't even get my work done because she is constantly talking to me or someone else on the phone or someone else in person.  And since her children are all perfect and just living the American dream it's a bit pukifying.  Not to mention no one else's family could possibly even measure up and even if you tried to tell her about them she doesn't have much interest in listening.  I already feel like an alien in that office because I am not part of a great big happy family and has a husband who I have been married to for at least 100 years.   I am trying to draw some boundaries.  I want to be polite and not a bitch but I'm not sure how to maintain myself in there.  It's like I can't get away from her (literally).  I've been struggling with this for a while.  I know nothing will change as she has been behaving in this matter for 30 years I doubt the boss is gonna turn things around now.  So my solution has to be something I have to do differently.    I just want to go to work and get my job done.  I really don't want to know every detail of the amazing life of June Cleaver.  Wow I sound bitter.  Is there anywhere where I will fit in?