Recommendations for good sounding streamer

Personally I would stay away from WiiM and the Unison as the both lack USB local play (there is no substitute.) Although when the network goes down (as it seems to weekly around here) nothing can be controlled with ANY "network" player. You might want to find something that adds Bluetooth so she can at least listen to Spotify from her phone during those instances.

The iFi looks like the best value but I only have a Bluesound, Allo USBridge Sig/Shant and a RasPi/iFi Elite in the budget space, so I can't comment on it's functionality.

I’d recommend the Zen Stream with the caveat that you should run it hardwired from either the router or a Wi-Fi extender as using it over Wi-Fi can have some frustrating connection issues.  I’d also recommend getting one of iFi’s upgraded power supplies if it’s in budget.  If you don’t need the DAC in the Node there’s no reason to pay for it.  I will say iFi’s customer support is non existent if that’s a concern.  Last, forget Tidal and do a trial of Qobuz — many here much prefer it and no need to mess with silly MQA unfolding BS.  Best of luck.

hardwire any streamer.

But of course.

I had the Bluesound, good quality, it's  no-hassle, very easy to install and use. Very good tech support, something many companies don't have. I used it with Qobuz and Spotify. I had to jump up the $5K range to get better sound then Bluesound. 

There are many to choose from, but for someone starting out, it's great and inexpensive.