One of my group members receives messages from the group but cannot post her own messages - why?

OK here is another thing if she post and if it has not got posted to the group..tell her to look in her mailbox.that will tell her if it was sent to the group and she got it back..but it never made it to the group..or if she has not seen anything..it like the other guy said if it is moderated it mean the owners or mod as not let it get posted or the one thing that also happen is the owners is not around and only the mod or both..if she see posting then she need to go the the group page and scroll down until she see the group Calendar and look on the very first day the group started..then click on that day and this way she can see whois the owner by reading the very first days post and when she has seen it..she can e-mail them and ask why..it make it easier and private