Is the sentence grandmother was a very special correct grammar?

The sentence "Grandmother was a very special" is not grammatically correct. It's missing a noun to complete the thought.

Here are some ways to correct it:

* "Grandmother was a very special person." (This adds the noun "person" to complete the sentence.)

* "Grandmother was a very special woman." (This adds the noun "woman" to complete the sentence.)

* "Grandmother was very special to me." (This adds the prepositional phrase "to me" to complete the sentence.)

The correct way to finish the sentence depends on what you want to convey.