I almost didn't post, but just couldn't believe someone would do this to a neighbor! And couldn't think of how else to get these people to understand that this is a major problem, besides just being rude neighbors.
I don't know about you hen, so sorry I can't help there. Hope she is OK!
If someone were throwing bottles or any other trash into my yard on a regular basis, I think I would ask the police to have a conversation with them. That is so disrespectful and endangers your pets. IMHO