No it doesn't hurt to use a dewormer while using Corid but if she is in bad shape and she doesn't have worms using a worming could not end well.I’ve been at work today unfortunately. I did give her belly a grope last night cause I did worry if it was her being eggbound or something - it wasn’t hard and distended - felt belly like. Get to run away in ten minutes at which point I’ll be calling the vet to see what the cost is/can they do fecals on chickens or if there’s general these worms of the area that I could get the dewormer at Tsc.
Would it shock her system to do both at once? De worm and corid?
Feel her belly again asap...compare it to one of your other layers or a few of them.