LP,I too am very sorry,I am sure letting go of Ava was not an easy decision,but I am glad she has no healthproblems.
As for Penny,do you suspect something is not right??
If so I hope sweet Penny will be ok and reunited with Lucky
I am sure you will love seeing Ava again,but you will probably be leaving in tears,as she will more than likely want to go home with you
I know you know dogs and have helped several towards a good life and I don't doubt that you are doing the right thing