kanozyo ha kotae ga tadasii to kakusinsita.

は marks 彼女 as the topic: the sentence is talking about her and then saying what happened with respect to her.

So the structure is roughly:

• 彼女は = as for her / she
• 答えが正しいと確信した = became convinced that the answer was correct

If you used 彼女が, the sentence would sound more like you are specifically identifying her as the one who was convinced, often in contrast to someone else.

Because 答え is the subject of the embedded statement 答えが正しい.

That part means:

• 答え = answer
• が = subject marker
• 正しい = correct

So 答えが正しい means the answer is correct.

If you used を, it would suggest 答え is a direct object, but 正しい is an adjective, not a verb that takes a direct object. So 答えを正しい would be ungrammatical here.

Here, と marks the content of what she was convinced of.

So:

• 答えが正しい = the answer is correct
• 答えが正しいと確信した = was convinced that the answer was correct

With verbs of saying, thinking, believing, knowing, and similar meanings, と often introduces the quoted or thought content.

You can think of it as functioning like that in English, although it is not exactly the same in every situation.

Because the sentence is expressing what she was convinced of: that the answer is correct.

In Japanese, when a clause comes before と, its tense reflects the content of that clause itself.

So:

• 答えが正しいと確信した = she became convinced that the answer is/was correct
• 答えが正しかったと確信した = she became convinced that the answer was correct

Both are possible, but they describe slightly different content.

Because clauses before と normally use the plain form, not the polite です / ます form.

So Japanese prefers:

• 答えが正しいと確信した

not:

• 答えが正しいですと確信した

This is true even if the whole sentence is polite. For example, a polite version would be:

• 彼女は答えが正しいと確信しました。

The final verb becomes polite, but the clause before と stays plain.

確信する means to be convinced, to be certain, or to feel sure.

So 確信した is past tense:

• became convinced
• was convinced
• felt certain

It is stronger than verbs like:

• 思った = thought
• 信じた = believed

確信した implies a high degree of certainty.

Yes, basically.

答えが正しい is a full clause meaning the answer is correct.
Japanese often places a full clause before と, and then adds a verb such as:

• 思う = think
• 言う = say
• 知る = know
• 確信する = be convinced

So the larger sentence is built like this:

• 彼女は = she
• [答えが正しい] = the answer is correct
• と = that
• 確信した = was convinced

Yes, 答えは正しい is possible, but it changes the nuance.

• 答えが正しい focuses on the answer as the subject of correctness.
• 答えは正しい gives 答え topic status, often with a contrastive feel, like as for the answer, it is correct.

In this sentence, 答えが正しい is the more natural neutral choice when stating the content of her conviction.

Because Japanese is basically an SOV language, and the main verb usually comes at the end of the sentence.

Here the order is:

• topic: 彼女は
• embedded clause: 答えが正しい
• quotation/content marker: と
• main verb: 確信した

So the sentence builds up everything first, and the final verb tells you what she did mentally with that information.

It can suggest either, depending on context.

As a past-tense verb, 確信した can mean:

• she became convinced at that moment, or
• she was convinced (describing her state in the past)

Japanese past tense often covers both the action and the resulting state, so context decides which reading is more natural.

No. Normally this would be written without spaces:

彼女は答えが正しいと確信した。

Japanese usually does not put spaces between words the way English does. Spaces are sometimes added in learning materials to make the structure easier to see.