I think early generations Weavers have more of their orginal body while later ones look more like GMS body.

The abdomen is server for little more than silk storage as the silk glands and all other organs have been moved up to the chest and abdomen. The orginal spinnets still function and can spin but the newer set is the "main" one to produce silk. The slik glands have been increased in size and moved to the back along the torso sides. The pins are punctured in a criss-cross to spike each gland and prevent production.

The metal plate on Widow chest you can barely see is there to hold the pins and prevent them from falling out from movment. I imagine there a some kind of lock mechanism to further keep them in. Either way it need skilled hands to remove with any chance of recovering the glands. But also insuring no other organs are harmed in removal.

I do believe the pins were placed by GMS as both a punishment and way to clip her wings and hold on to her. Without Silk Widow is forced to relay on her claws and body for safety. I wouldn't doubt her staying up at the peak of bellheart is just as much about safety as it is guilding the silk threads. Her body worn down from the frantic playing of the strong threads slowly cutting her shell and without silk to bind she just in bad shape.

In a timeline where Hornet spared and saved Widow, Hornet have to supply the silk needed to heal her. The mask would also need to be commision on Hornet end as Widow would not be in a sane enough state to be reasoned with or talked to.