Question

she(wait) for you since early morning.​

Answer 1

She has been waiting for you since early morning.

Answer 2

You have to write the sentence properly irrespective of what the event will be. The meaning should be good. A meaningless sentence dont have any grammartical existence. While changing the verb form, you are undergoing a change in tense too which should carefully be taken into consideration.

Here, the matter is, the word "wait" should be changed in such a way that it should not make the sentence meaningless. Also, the sentence should be logical on the other hand. We have to think once before writing a sentence using tenses of what we are thinking.

Following every rules, the sentence, She has been waiting for you since early morning, is grammartically meaningful and appropriate.

So, the final answer will be, "She has been waiting for you since early morning."