At what date is the estate valued for inheretence in my case?

My Dad passed away unexpectedly two years ago. I was told by my Mom that he (surprisingly) did not leave a will. He worked very hard and did well financially. She gave my sister, brother and I each $10k "because he would have wanted us to have it". My Mom hasn't worked in years and recently bought 4 investment properties paying cash in order to earn rental income. Now I find out today that in the state of Georgia she was only entitled to 1/3 with the rest split amoung the children. Now she has blown through who knows how much on shopping sprees to maintain her lady of leisure lifestyle at our expense. I plan to sue for what is ours. My question is - at this point will they evaluate the assets owned as of my Dads passing or now, and will it include the properties she has purchased?