Would suggest that you should wait for your QB to arrive first before deciding if to change SA/store, might not be so nice to switch SA within the same store. And to which store you should go to, again depends on which store you'll meet a SA you have chemistry with.
I'm just thinking that since your current SA already put your wish list into the system after you hit the quota, she isn't so bad after all right? I've heard that some SAs just keep on make you spending without even mention anything about wish list for QBs and some SAs demand spending way above 1:1, 1.5. And yea.. those deposit you've placed won't count until you collect the items so that will be for the next QB and not the one you are waiting now, if you switch store, then the deposit items will not be counted at the other store.
Yes, I've heard of the SAs need to cater some time for walk-ins, so maybe the reason why she cannot take your appt if her schedule is already full for the day. I'll usually make my appt 1-2 weeks in advance as I can only make it over weekends, even so with this advance, my SA is already quite packed with appts sometimes. So yea.. they are very busy and patience is really the key.