Quote Originally Posted by wolfsspirit View Post
Before you could not summon your retainer when shes standing somewhere and selling items at the moment.. summon could only be done when your retainer isn't actively selling stuff..or if you could summon , your retainer has to be reactivated to sell stuff again.. so unless that is changed , it's useless
May be wrong here and may have been changed , but that's what i remember how it was.
I've confirmed:
You can summon your retainer out of the ward to exchange items with her, even if she is selling items.
You can then send her back and she will continue to have those items in her bazaar.
There is an issue that you may not be able to send her back (but this is probably a bug).

So, bugs not withstanding, you should be able to deal with your retainer anywhere/anytime ^.^