
Are your pups in a different room to the rest of the dogs? My girl was like this at about exactly the same age and I was asking the same questions. We had her and the pups in an upstairs bedroom, but she hated missing out (or thinking she was missing out) on whatever else might have been going on in the house, so spent more time outside of the room than in the room.
I decided I didn't want to wean early, and I built a puppy pen downstairs in the middle of the living room (I had planned to do that later anyway) and moved her and the pups downstairs during the day and then back up at night. This solved the problem. She was happy to stay in with the pups most of the time, while still feeling a part of what was going on in the house. She didn't mind the other dogs outside the pen, and she returned to being the awesome mum she had been prior to that point.
I know one of my other girls would have totally thrived on having her own private quarters, but the personality of this one needed to companionship of everyone else around her. Under normal circumstances I would have kept them separate a while longer, but mum needed more companionship. Pups were weaned at the original age I planned to and all went well :)
Just an idea, if that's your current setup.