You have a few BPD traits listed there.
she does have the ability to stop her emotional based behavior and see that there could be a different story to the one only given to her by her mother, currently both daughters are fighting because my oldest feels she is disrespecting her mom by not staying with her and not wanting to listen to her emotional driven statements
You're not getting in the middle of it. The daughter that is more emotional than logical, is she loyal to dad? Is she fighting with mom because of the RO?