Aw, poor Hootie! Jaden and Jewelina send her LOTS of kisses!!
It's tough when you bring a new dog into the picture, Jaden is such a momma's boy and when I brought Jewelina home he wanted NOTHING to do with her and would even act mean when she came near his bed or toys, and this is my darling sweet boy who NEVER acted mean towards anybody!!
Adjusting is hard for everyone and sometimes it just takes time. When I was a kid we used to move around a lot and every new place we moved to I kind of felt out of place and had to re-adjust and get "comfortable" again. Maybe Hootie just needs some "adjusting" time of her own. Perhaps you could crate Lamar and Hootie in the living room or somewhere where all of you are and just let Hootie run around for a little while, then let Lamar out with her for a bit with Hobbs still in his crate and then eventually let all three of them out.
I'm sure everything will work itself out in time! Hugs to you and Hootie!