Some great sales on the H3 these days (<$700).

If she's riding Zwift with any frequency it's worth it to have a dedicated setup. Yes, you can keep swapping bikes but convenience is underrated (that's why I have a dedicated bike on my trainer....I know I'll end up skipping or shortening workouts if I have to swap my roadie on/off every time).

Another option is to go with a KICKR bike/WattBike/etc. that you can each quickly adjust to your fit coords (assuming you use the same crank lengths and pedal types).

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ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)

You can buy a lot of trust for 1k ;) Seriously, teach her how to do it....

Do you have the space to keep both trainers setup all the time? If you do I would definitely buy a second trainer. As soon as you or her get a new bike with a different standard and have to start screwing around with thru axle adaptors and/or 10 vs 11 vs 12 speed cassettes the hassle of changing bikes increases exponentially.

However physically moving around trainers is also a complete pain so if a new trainer means having to move the things around between uses I would just keep a single unit.

In the same spot, my 12yo is on an older MAG trainer and rides with me. We are now looking for another smart trainer

Unfortunately there is nothing available anywhere. Any good used ones sell within a couple min.

Yeah. I have QR, she a thru axle. So each swap requires changing over the adapters on my first gen Kickr (which I got used while back). And why I prefer she not mess. Her bike nicer than mine!

No rush to this. And agree, she capable. But may be my excuse to finally upgrade.

We are in a similar boat here, except we have 5 people who need the trainer. We went ahead and bought a second trainer and I don't regret it at all. Everyone puts their own bike on the trainer and everyone removes it when they are done, including my 12 year old daughter. Two of us use thru-axles and the other three use a quick release. If they are smart enough to ___ (fill in the blank with whatever time wasting electronics your kids are interested in) then they can put their own bike on the trainer.