She was astounded and was staring agape at the mouth-watering strawberry.
As far as I know, "agape" is not an adverb. Is it placed correctly in this sentence?
Can I edit it like this --> Harriet was astounded, her mouth agape with incredulousness, staring at the mouth-watering strawberry.
Correct, agape is an adjective. Your sentence and your usage is natural.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
The use of 'mouth' twice is a small flaw in the second sentence.
The placement of the participle clause is not quite right. I suggest putting it at the beginning.
Staring at the mouth-watering strawberry, Harriet was ...
That makes it clearer that Harriet was doing the staring, not her mouth nor the incredulousness, far-fetched as those may seem.
In my opinion,