She’s in her most balanced state yet, honestly I think just reducing the deployment time of her TP and something additional to help her survivability is all she needs.
Personally I’d like them build her Shield Generator into her Photon Barrier/Ult, make it to where Symmetra and her allies get 10 shield hp every 1.5 seconds (max of 50 shields added to their health). Whenever they stand within a 3 meter touching distance of her Barrier.