Sorry I don't have advice either, other than the two dogs must not be left alone together at any time. You got off lucky this time with no major injuries, but these dogs are big enough to kill if they wanted to.
Since you have no history on Jada I would contact the rescue that your friend got the call from and ask them to help you rehome her. Please do not put an add on the internet or in the paper, and do not offer her up for free to anybody. Too many dogs end up being taken for bait dogs or fighting. Please be careful in rehoming her. The rescue may be able to help you with this as I said, especially if you can keep her with you until a new owner is found.
Hopefully bumping this msg up will get a reply for you.