Room with glass windows as a walls.

@surfmuz Last I looked a JRiver license was about $75 while ROON is a lot more. However, if you think of those 2 as a piece of audio gear, it is not that much. I use a very cheap ($500) DELL PC to run ROON. The same can be done for JRiver and then connect to QoBuz. My cheap $500 computer is in a different room from my audio gear (a different floor too).

Not sure about the cost of ROON these days but I bought a lifetime subscription 10 years ago for $450. The best audio purchase I ever made.

What I suggested with the DSP done using convolution filters will 100% solve your daughters' audio room.

She actually understands all my explanations about acoustic issues at new place, but she doesn’t take it seriously.

You can avoid being interpreted in ways you don’t like easily. Don’t be vague. Describe the situation unambiguously. 

Use a pair of Magneplanars or similar dipoles which have less interaction with the sidewalls the room. That will at least mitigate reflection problems.

I have used the large Marigo dots for windows successfully for years. If she can accept 2 - 3 inch white dots placed towards the corners of the windows in the listening area, this may be the solution. 

@grislybutter do you think it would be helpful to describe it unambiguously when the situation is ambitious!?