Why would the author use the word "awhile"? Is it unnecessary? [closed]

Quote: "Sitting awhile in the sun, she might make some sense of the problem"

Why use "awhile" while one can just use "while"?

Why one can awhile just use "While", would use "awhile?" [Does this even make sense]

Awhile is an adverb, it states the length of time in this case.

A while is a noun, it means a short time.

After a preposition, you´ll have a "NOUN". (Now let´s LINK everything together).

I can now say: Sitting awhile in the sun, she came to her senses. (Adverb: How long? some time, awhile)

With a preposition:

Sitting for a while in the sun, she came to her senses. (Preposition "For" follow by a noun "a while") (It´s a noun because we have an article "a" before it.)

Whichever one you choose, it´s just a matter of writing style.

While is a conjunction as well as a noun and even a verb too.

A while means for some time.

Sitting awhile in the sun, she might make some sense of a problem.

A while is a noun phrase meaning a period of time and awhile is an adverb meaning for a time.

While he was playing, I was reading.

Here while is a conjunction meaning when.

He whiled away his time uselessly.

Here while is a verb meaning spend.

Here are two links which helps you know the differences.

https://www.merriam-webster.com/dictionary/while

https://www.quickanddirtytips.com/education/grammar/while-versus-awhile