That she was the only one who came made a huge difference in our plans.

Question

Is this a Sentence or a Clause Fragment?
I think it is a sentence but can somehow check my answer?

Answer 1

Here's the breakdown:

That she was the only one who came = a noun clause, serving as the subject of the sentence.

… made a huge difference in our plans = the complete predicate of this sentence (that is, the verb "made" and everything that goes with it).

Since it has a subject (noun clause) and a verb (complete predicate), it's a complete sentence.