"She will make this decision with colleagues."
Would this sentence still be functional without the 一起？她会跟同事做这个决定
Also, could the 会 be put before 做 as in 她跟同事一起会做这个决定？
Both great queries! I suspect the first answer would be in the negative as 一起 confirms collaboration rather than just going along with a majority decision. The second? Hmmm. Possibly. Just can't be anymore authoritative. :-/