Hi, Jo! I'm Joan :) And I think I definitely have a few characters from my roster who might know Bree!
First of all is Maizie Wolfe (this journal), who lives at the LBJ but has made several trips to the Dog Park. Likewise, she has made friends that live in the camp, including Vic and his son, Sasha, and Bishop. While she may not know Bree well, it's possible they might have had a conversation or something at some point! Maizie loves meeting new people.
More likely to have regular interactions with Bree are my two Dog Park residents -- Bunny Dolan (itisenough) and Ruth Fields (quick_trigger). Bunny has been living at the Park since the autumn. She's currently in charge of the small number of livestock the Hellhounds own and is working on a greenhouse -- Bree is welcome to help out with either if she would be interested in such a thing. Bunny is very welcoming! Ruth is the resources manager, which means that she wrangles the camp's supplies. Though she's less friendly than Bunny, neither is she openly hostile. Just ... cold. Neverthless, odds are good that she and Bree would have regular interactions, depending on how frequently Bree came to the hangars.
And since you mentioned that Bree might have spent time in other non-ID-required shelters, if she ever passed through the tunnels she might have run across Kevin Clarke (escapevelocity) who's been living there since the beginning of the uprising.