Why won't the mother dog feed her puppies anymore?

A dog I recued 1 1/2 ago has had puppies..yes its my fault but the vet woundnt do it earlier she was to young so he says...she had 6 puppies I made a nice big box witha heatlight and helped her deliver.. she was good mom and new what to do when they turned 3 1/2 weeks old I notice she wounldnt get in the box anymore she would sit outside and hope they make it over the wall to eat..I would place them on her and she would feed them find when she was done she would just get up I would have to put them back in the box...so I finally figured it out the box had gotten to small, yes the puppies are big...so I moved the family to a spare room nice and big and warm...them the mom stop feeding them..I waited a whole day to see if she would and she didnt...so I brought some puppy milk and then when I started feeding them she got in the box and started feeding them...only for alittle while..the next feeding I made her feed thm...thats when I noticed she has teeth marks on every nipple...if they bite her she bites them back nto hard but hard enougn for them to stop sucking...now I feed them all the time first I let her try cause she still have plenty of milk...I stop her from following me around the house and make her sleep in the room with the pups...cause she wont if I dont make her...so now she wont eat there poop anymore cause it smells not like her milk I quest...everytime I go to feed them she comes and lays there in the box...I dont understand it...she has diaherra to now its white chalky liquid on top...the doctor has seen her 3 times gave her entric and metronidazole...but she still has it...she poops on the floor almost every night and pees...knowing she going to get in trouble...the puppies are fat, playful but I no they want her...how can she teach them anything if she wont spend time with them...unless she wants to...she hates feeding them..but...she will once in awhile
I dont no what to do or not do...I need a breeder to tell me is this normal is it not...oh the vet said I can give the puppies blended up puppy food... can anyone help me..I am willing to give my phone number to anyone who knows about moms and puppies to get advice...I am so burned out...just ready to give it all up...HELPPP

It could be they're old enough to eat other food...I don't know, though. I'd call your vet.

Well she might of quit feeding them because she might be out of milk try feed the puppies a bowl of milk ...if they dont drink at first take your finger and dip it in the milk and put it the puppies mouth...If that dont work then you'll have to bottle feed them

I have exactly the same problem, my dog had 3 pups 4 weeks ago(one died at birth)and she has been a great mum until now
she gets aggressive if they try and feed from her it's a bit of a nightmare watching her all the time,they are eating a bit, soaked biscuits, mashed up puppy food and a small amount of goats mik and lactol,but they cry all the time for there mum,if they try and feed off her she attacks them,I can understand in a way, because there teeth are getting big now,they are border terrier cross puppys, I have started restricting mums food slightly so that her milk dries up, don't now what else to do,
hope everything sorts it self out for you me and the poor sweet puppy's