
Hi, I found the same with my girls re conflict between maternal duties, an attachment to me.
It is why when my children reached teens I put whelping box by my sofa, until then it was in my bedroom.
I used to find I needed to stay with her and pups most of the day to discourage her leaving them, though to be honest I rarely left them unsupervised in first few days until I knew Mum was careful.
Some breeders never leave the bitch alone with pups.
In some very heavy clumsy breeds even removing pups and only having them with Mum to feed, very extreme in my view.
Luckily my own breed is quite natural and medium size.
Sadly I did loose one puppy to crushing, after a slow long labour, both the bitch and I asleep exhausted.
Rails would not have helped, as pup was in middle.
A shock as this was a careful experienced Mum who had reared a large litter before.
Regards temperature, I too have found the temperatures often quoted as excessive.
I wonder if these are for cold facilities, where the ambient temperature is low, and for open tray whelping boxes.
May also depend on coat. Mine is a double coated Spitz breed.
I find room temperature much over 20'C hard to tolerate.
I use a heat pad around A4 size in 1 x 1m box. This box is surrounded by puppy pen panels, with a hinged panel secured over the over top. The panels are surrounded by cardboard around sides and lower part and sides of gated front panel. Then a thick blanket goes over top and sides to make a cave.
This then keeps out draughts and keeps in humidity.
I keep an oil filled electric radiator by the side with thermostat, which will kick in when temperature drops. A thermometer is on front if the pen door and I keep temperature at about 22'C.
I have found the pups rarely huddle or use the heatpad after about 4 or 5 days.
Once their eyes open, I switch the pad off in the day. At 3 weeks no longer room heating at night, but put the heatpad back on at night.
At 4 weeks no more extra heating.
Mine will be spending some time outdoors after 4 weeks even in snow, but temperatures where I live rarely go below 0'C, certainly no lower than -5'C.
Hope that helps.