Which sentence uses the correct form of 'to'?

The correct sentence is "She wants to go to the park" because it uses the infinitive form of the verb "to go" properly. In this context, "to" is used to indicate the action that she desires to take, which is going to the park. The sentence structure adheres to standard English grammar by correctly combining the verb "wants" with the infinitive "to go," thereby conveying a clear intention.

The other options include mistakes that disrupt the grammatical integrity of the sentences. The misuse of an apostrophe in "want's" suggests possession rather than the correct conjugation of the verb "wants." The use of "too" in the last two options incorrectly implies excessiveness, altering the intended meaning of the sentence.