What is the correct form to express the feeling: She doesn't feel ___ about the situation?

The appropriate choice for expressing the feeling in the sentence "She doesn't feel ___ about the situation" is "bad." In this context, "bad" functions as an adjective that describes the state of her feelings toward the situation.

Using "bad" in this case aligns with standard English grammar, where one would say someone feels "bad" about something that has happened, especially when referring to an emotional response.

While "well," "good," and "badly" are also related to feelings, they serve different grammatical roles. "Well" is typically used to describe how someone performs an action, not how they feel. "Good" is an adjective that generally describes a state of being rather than an emotional response and is not used correctly following "feel" in this context. "Badly" is an adverb, which does not fit grammatically because "feel" should be followed by an adjective.

Thus, "bad" is the only term that correctly completes the sentence, making it the right choice.