Sounds like resource guarding. Food is one resource, you and hubby are another resource. Best I can come up with is you and hubby need to retake the resources and make sure each dog knows they do not own anything, that you and hubby allow them access out of the kindness of your hearts.
Min-Pins are very Terrier in their attitudes toward other dogs and typically will not back down from anything, regardless of size. It's one of the endearments of the breed. However, now that Duna is passing puberty and becoming a full adult, she won't want to be bossed around any more. Neither should be allowed to boss the other. When a trigger for an altercation is presented, you choose for them where and when they will sit with you, eat, pick crumbs, etc.
When you have to pick one of them up, make the other sit and wait. If she complies, reward appropriately. If the jumping starts, a very sharp, "NO!!!" Would suggest make them both sit first then pick one up. It will take repetition and practice, so you will have to do this a few times each day, with each dog. Other experts here may have more ideas.