@mom60 , if your daughter is looking for a bike that provides an upper body workout combined with cardio, then the Rogue Echo bike or the comparable Schwinn Airdyne Pro are both good contenders. It so happens that Rogue Fitness sells both its Echo bike and the Airdyne Pro. https://www.roguefitness.com/schwinn-airdyne-pro Rogue also sells the Assault Airbike https://www.roguefitness.com/assault-airbike-and-accessories Three bikes, three price points. Rogue is an excellent company to deal with. Quality products, great customer service. A Rogue rep would be very helpful to speak with to answer questions about which bike would best meet your daughter’s needs and wants.
I would agree with @sushiritto that these fan bikes are better for shorter high intensity interval workouts than for longer endurance workouts however, that’s not necessarily a bad thing. In a 30 minute HIIT workout, you can get all of the cardio fitness and health benefits, in a time efficient manner, that a person needs. HIIT workouts also torch calories. There is no need to ride a bike for an hour or longer unless you have specific training goals that require longer training and general fitness and cardio health don’t require that.
As to TRX and your daughter’s concern about visual disturbances, if your daughter is looking for a way to do some resistance training, which everyone should do, TRX is about as safe as it gets. No weights to drop, infinitely variable resistance using just body weight, you always have your feet, hands or body in contact with the floor and its very easy to disengage safely from the TRX if you have any issues. She would probably benefit from a couple of sessions with a qualified trainer who could show her how to use the TRX safely and effectively within the scope of her limitations.