There is a great calculator on LB info pages just for this sort of thing.
http://www.lilbeginnings.com/info/breeding/ Just click the link a little bit down the page and you'll go to another page where you can enter your numbers and get the dates.
I have used it several times just this week and mostly I get the right results (I checked earlier ones) but I did get some odd years, so I think there might be a bug somewhere. Be sure to enter your date in the exact format required (so yours would be 08/30/2012) and then 01/22/2013 for today.
Must admit that I never bother with how many days - I just take 30th August and count backwards to the 'important' time - 11 months to end July so start watching for developments from approx mid June! Works for me. LOL!!
But do keep us posted as to her progress, and dont forget the pictures!