Room with glass windows as a walls.

@surfmuz

Does your daughter use ROON or JRiver for audio streaming?

If so, call Digital Room Calibration Services, Convolver, Headphone Filtersets (accuratesound.ca)

Mitch Barnett will setup DSP for your daughter’s audio space to make her system work.

You will not need any physical acoustic panels using the convolution files that Mitch will create. This guy is a genius Audio Engineer and written an impressive book on DSP (see Amazon.com).

The cost is $750, and he will create the DSP files remotely (with your daughters input). Your daughter first acoustically measures the room using a decent mic ($100), free software, and a laptop.

Doing DSP this way is way more effective than using any DSP features on any low computing audio gear.

Resources – Audio Digital Signal Processing - Accurate Sound

@ yyzsantabarbara No Roon or JRiver. She has access to my Qobuz Studio Family tire and she stream it via Teac NT-505.

@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.