Why can't I chat in the chatroom on my computer under my screen name when my friend got banned from that same chatroom on my computer under her screen name?

My friend was on my computer under her screen name chatting in these two rooms I always chat in. Then she got banned from both of them by the channel owners. Then, when I tried to chat in the rooms, it wouldn't let me. I even tried making new accounts but that didn't even work. It seems like they banned the computer instead of her screen name. Could you please fix this problem because I would love to chat in there again?