The moment she feels both motors working together, she is going to understand why you chose this one. The curved shaft rocks back and forth against her g-spot while the flickering rabbit ears work her externally at the same time, and that combination of internal movement and external stimulation is something that builds on itself in a way that straightforward vibration simply cannot replicate. She feels the fullness, she feels the rhythm, and then she feels what happens when both of those things arrive at exactly the right moment together.
She controls all of it through three simple buttons, running the shaft and the stimulator independently so she can dial in the exact pressure and pace that works for her body. Ten vibration functions on the ears alone means she moves through escalation and pulsation patterns until she lands on the one that pushes her over. The rocking shaft adds three speeds of that back-and-forth motion against her g-spot, which is genuinely different from vibration in the way it feels inside. Two hours of charge time gives her two full hours of use, and the waterproof construction means the bath is now a very reasonable option.
You picked something that actually understands how female orgasm works, internal and external together, adjustable, unhurried. She is going to feel that thought in every function she tries. This is a genuinely great choice.
