Argeeee, we're not on the waiting list at the moment - youngest is now in Grammar thankfully, but 2 years ago we were in the same position as you.
On allocations day she was 4th on the waiting list.
One week after allocations day she was 1st on the list.
We then had to wait until (about) 2nd June to get the 'phone call that someone had given backword and she was offered a place (that was about 6 days before the oversub appeal - oh how I laugh now ).
Yes, we lost our deposit, but we knew that was a gamble we were taking when we took the root we did, having the indie as our fall-back position - better to 'lose' £4,000 and get a great free grammar, but with the guarantee of a great indie than not have any good school at all.
My fingers will be crossed for you