The word feedback has evolved over the years, and is now accepted as a countable noun. Therefore, if feedback shared frequently in certain professions, each feedback unit is countable and hence its plural is now accepted as "feedbacks" .
Also, when you use the word feedback in the phrase "one of" as in one of the feedback shared with her, sounds rather incorrect.
As the last two posts illustrate, 'feedback' is one of many words that is evolving, that is in a state of transition.
It's easy to sound awkward when using this word as a count noun. The previous post points out one way. Another example of awkwardness is to say something like 'Please look at this sentence and give me a feedback'.
Oh, no you don't Nona! I'll take responsibility for not having enough kettles and drinking barbarian drinks like coffee more than tea, but not this one! I have never, ever heard of feedback used this way, despite the anonymous posters assertion that it is common. And I work with some of the most jargon-loving people you will ever meet. Feedback is not counted. If you receive feedback from many so