I'm afraid I don't have very good news to share. While I always do my best to come up with a good solution to a customer's situation, often times, the law does not provide a good solution, which unfortunately I cannot change that. This is one of those times. But please remember that I am only here as an information source, so please do not hold bad news against me by giving me a negative rating.
In order for your grandparent to pass on citizenship to you, it must be because your parent was a US citizen "at birth," but unable to "transmit" citizenship to you because your parent did not live in the US before your birth.
Because your mother was not a US citizen at the time of your birth, it is not possible to get citizenship through your grandmother.
I'm very sorry. I tried to go through the law to come up with a possible argument, but the lack of the very basic requirement of your mother being a US citizen made at the time of your birth made it impossible.
I hope I have answered your questions. Keep in mind that I only get credit for my work if you rate me positively. If you're satisfied with my answer and my professionalism - not the outcome or the state of the law which I cannot control - please select a top-three rating. Again, if you feel the need to use "poor service" or "bad service," please ask follow-up questions instead, so that I can try to help you further. Remember that the bottom two negative ratings are used for Experts or professionals who are rude and/or bad at their job, and I'm confident you'll find me to be professional and truthful with you.
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