Silence fell inside the tent, and Bree didn't say anything. Though she was kind, her first motive was to stay alive, having died in her first life just because she was kind enough not to cut off the little stalkers' of her stalkers led her to be killed in such a pathetic manner. So, even if she felt a bit sorry for Ashlyn, there was no way she would do something as stupid as letting go of the woman who tried to harm her without any rhyme or reason.
She was indeed kind but her kindness came with a bottom limit and that was her life. As long as her life was threatened she would try her best to end the trouble as soon as she can, which was why she did stop Yakov from interrogating Ashlyn.