Ages and weight might help a little, but nothing is certain. One of our rescues was supposedly a full grown English spot mix. Turned out to be a pure Checkered Giant and she tripled in weight and size to almost 20 pounds.
Neither have really identifying features. If you think lop maybe mini lop mixes. The weights would be right as mini lops max at 6.5lbs. I think that’s really the only breed I would suggest at least for your girl.