It is possible that they are looking into it to see if it is a genuine or not review, and whether or not it is linked to you, before getting back to you, and have nothing to add until they find out.
If its a genuine review i'm sure it will remain, but the reply removed, and if its a fake review then i'm sure the whole thing will be removed.
Your could possibly have been a little more courteous in your replys to LuckyLu, so she is possibly not replying till she has some thing concrete to say instead of arguing with you and making you even angrier with the mods.