I've never tried netting a Hen while she was sitting on keets... I 'spose it could be done if you can gently pull her off/away from the keets... most likely she's gonna flip out whatever you do tho, and the keets are going to scatter and try to get back under Momma, so however you attempt it be sure to have a helper and grab those keets fast! Not all Hens are as explosive as some can be, but I'd be prepared for the worst case scenario, just in case. Better safe than sorry!