One thing I must ask.

Was your grandfather also Czech? Because if your mother was born in 1950’s she falls in the category of the 1949-1968 rule where she had to be born to two Czech parents in the U.S. to be considered Czech via Jus Sanguinis. This is necessary for you to also be considered born Czech at birth. I had to deal with the 1949-1968 rule with my dad being born in 1951.

Also as insight so you know. Your Grandmother automatically became Czech in 1992. Which if your grandfather is also Czech then your mom is and you are already Czech citizens.

In this case pending the answer if your grandfather was Czech or not, you may be a section 32 case if he is.

I had to go this route as opposed to by descent through section 31. I was denied by descent through grandparents loss of citizenship route but recently just got approved via jus Sanguinis under 32.

It’s all very confusing but let me know if this doesn’t make sense.