To explain the entire situation that leads us here as I see it;
The initial plan did not involve them splitting up for an extended period of time. The initial plan was not followed, and Sagisō being in character prioritized her sister over the mission -which she will always do while on a Konoha mission.
Hina at any time post that could've chosen to meet up with her team, because she was watching them on Island Alpha. The small issue with that is the Jinchuriki. Hina has no love for the Jinchuriki.
She'd at most tolerate Henshina's presence. She does hate Kumogakure after all. In character, she would choose to force the Jinchuriki into submission rather than be buddy-buddy with her. Remember the entire reason for the Anbu masks is she wants Kumogakure to suffer a loss. She's got a mini-vendetta to work with. I can't push her vendetta & be buddies with Henshina.
Henshina and Hina will not get along. That is simply a matter of character.
Since Henshina is all buddy-buddy with the team, Hina chose not to meet with them because that would be counter-productive. Additionally, it makes the arc becomes anti-climactic if they walk off with the Jinchuriki. Plus, do keep in mind that I want this mission to fail.
That being said, Hina and I are reacting to the situation. The tracking tags on Kiro, Tayuya, and Takato are still functional. Keeping that in mind, she knows their location at every second and their movements will be known by her in real-time.