Harriet is a member of of the Ace Operatives.
Clover is Harriet's teammate.
Vine is Harriet's teammate.
Elm is Harriet's teammate. In "Pomp and Circumstance" she laughed at Elm's joke about Marrow's intelligence making him a liability. Shortly afterword, Elm seconded Harriet's remark that the Ace-Ops view each other as coworkers not friends.
Marrow is Harriet's teammate, and newest member of the Ace-Ops. There has not been much interaction between them, but she is known to tease him. After he voices his annoyance at "babysitting" Team RWBY she responds that she "babysat" Marrow most of the time. Later in "With Friends Like These" she snaps at him to stop holding back during the fight, to which he claims she is being too excessive.
She gets along with Ruby during their mission in "Ace Operatives". She was quite impressed by Ruby's Semblance when Ruby used her Semblance to catch the last remaining unstable Dust crystal in the cave.
In "Gravity", Harriet and Ruby's relationship becomes strained, as she didn't stand with Ruby to save Mantle because she didn't want to betray Ironwood.
Later during the events of "With Friends Like These",Ruby is shown to have tried to appease and deescalate the fight between her and Harriet,only for the Atlas Specialist to answer with scorn and later Harriet is shown to become increasingly angry due to her and her team's inability to defeat both Ruby and her Teammates and later seemed to have begrudgingly accepted the fact that Ruby and her teammates have now become genuine powerful fighters that required her and her own team to fight with their full power despite her initial low opinion on the latter's skills.
Harriet is shown to have a positive enough relationship with Yang and Blake to work effectively and strongly together during missions and during the course of the girls time working in Atlas together with the Ace Ops,its been shown that Harriet has come to genuinely trust the girls with important tasks,as seen when she was able to coordinate with the two during their operation to apprehend Robyn Hill and later took the two's word for it when they falsely reported that Robyn had managed to escape them.
Later during the events of "Gravity",Harriet's opinion and relationship with the two is further strained upon learning of team RWBY's deceptions and later expressed outrage and a tone of clear betrayal upon her learning of them purposefully allowing Robyn to escape from them during their sting operation and later began hostilely verbally arguing with them due to them betraying the trust she place in them.