Healthy pitt puppies, time to wean them yet?

My first time mother pit bull gave birth to 9 beautiful, large, healthy pups thanks to the calcium tabs she received every day. :) They are 5 wks old today. She absolutely hates to be around them and when we seclude her with them she just walks in circles and barks woefully. :( The pups are extremely healthy, and fully have the concept of drinking water out of a bowl and eating semi wet beneful puppy kibble from a pan altogether. Its the cutest thing. They use the bathroom on their own and play and fight and knaw on my ankles when I hang out with them. Since the mother dog makes such a raucous when we try to put her in the kennel with them, we have shortened her feeding times to around lunchtime and then she spends the night with them. But now, the spending overnight with them is too much for her. She barks and barks and we have close neighbors. I will continue to let them have her at lunchtime because that is when her **** are so full she looks hot and miserable. Then she doesnt complain. My question is, is this once a day feeding alright for the puppies and is it okay to leave her away from them over night? We tried this method last night and all seemed well. Should I continue? (My ankles are testament that the pups teeth are quite sharp now)