Would the sentence She Bob and Bill found that it was difficult be grammatically correct?

No, that sentence is not grammatically correct. Here's why:

* Subject-Verb Agreement: The subject of the sentence is "She, Bob, and Bill," which is plural. The verb "found" should also be plural, "found."

* Word Order: The sentence is also awkward. It would be better to put the subjects in a more typical order: "She, Bob, and Bill found...".

Here are some grammatically correct options:

* She, Bob, and Bill found that it was difficult.

* Bob, Bill, and she found that it was difficult.

* They found that it was difficult. (This is a more concise option if it's clear who "they" refers to.)