Bummer, your WAF is a serious limiting factor to contend with. Just a thought buy my DIY Skyline diffusors have been called 'art' by many visitors and they work very well acoustically too. Would appealing to her artistic side work? If you want info then ping me and I'll send you a write up I did for them.
There are also some firms that make "pictures" with absorption behind them (I think GIK and ASC offer them) so she can be admiring pictures of the little kiddies whilst you're enjoying the sonic and visual benefits.
There are also some firms that make "pictures" with absorption behind them (I think GIK and ASC offer them) so she can be admiring pictures of the little kiddies whilst you're enjoying the sonic and visual benefits.