Yoni Massage
Okay, here's what I want you to do after her menstruation has stopped completely. It's called a Yoni Massage. This will help her determine where the fullness is, and tone up the walls of her vagina, furthering the healing process that the castor oil pack started. :)
Yoni is the ancient Sanskrit term for womb/vagina, and I always liked it much better than our terms. :)
Your wife should lie on her back, knees raised, feet flat, as relaxes as she can be. She should be taking very deep breaths. Remind her to breathe.
Then you, the massager of the Yoni, should reach in witih your dominate hand, 3-4 fingers held together, as deep inside as you can go, PUSH against the wall of the vagina, and pull out as you push, so the entire wall gets massaged. Reach back in and start again, rotating to a new area, until every single "wall" of the vagina has been massaged. Go easy on any scar tissue.
While pushing against the abdominal side, you can rest your other hand on the abdomen to use as a counter-force.
As you push towards her rectum, see if you can feel any bumps/hemrrhoids to explain the fullness feeling.
You can also check her ovaries by reaching up to the sides - the points of the triangle, and with the other hand pushing down until you find the "nub" of the ovary. They should feel like soft almond-sized nubs.
That's about it! :)