Why would getting her her brother help??!!" So that you can just take him away from her again. ThaT solves nothing mate. Dont just stick her in the kennels with the others. Get them out together first in the field. Lead walk them all together, let her brush next to the other dogs as you walk along, holding the lead in the same hand...
Dont force anything into her mouth, it will do the dog no good, only spook her of the stuff your trying to feed her... As long as she is taking water, and not dehydrating, she will be ok. You say she takes out of your hand, well thats how it will have to b