My hen pooped out worms two days ago and they were roundworms so I got wazine 17 to worm her. I put the right amount in their water and she drank quite a bit this morning. She also hasn't layed an egg in around 1 month. I went down to check on them about an hour ago and she was in the nesting box. She hasn't got in the box since her last egg which was about a month ago. So I thought she might be laying an egg but I went down an hour later and she is still in there but no egg!! Also she tried to bite me which she had never done before! What do you think is wrong, maybe the wormer because she hasn't been wormed before. Any ideas?