The AVG Zen is for the administrator only - to see the notifications - in this case I gues it's you. On your wife's device just download the AVG for Android or AVG Cleaner - no AVG Zen - and join those apps to the Zen network. This way only you will receive the notifications and only you will be able to manage other's devices. Your wife will have a peace in mind, not receiving notifications but knowing that you are taking care of her device.
Please let me know if you have any other concerns or questions.
Have a good day,