Do I have a standing for contesting a will, that my grandmother left, that I used to be in, prior to another female obtaining nearly everything?

I used to be in a will, that my grandmother told me I would be beneficiary of all property and assets at her death. We did not always maintain super close relations because of physical distance, but in the recent history a female came into her life. She supposedly began a friendship with my grandmother and I believe began handling my grandmothers finances etc. She had only known her for 5 years prior to her death. none the less, at her death this "new friend" had made it known that she was the executor of my grandmothers at that time, of a will signed only 6 moths prior. This "friend" ended up with the house, and the "friends" husband had been left both vehicles. The "friend" had also been left all other assets, minus personal possessions that were to be sold and given funds to the local church, and 2,500 a piece to 2 others. I was completely written out without any foretelling by her. I just want to know if there is any thing i can do, being I was in prior wills.