I have an 1x drivetrain and could not possibly go up the Radio Tower and keep a decent cadence not even,say, 50 RPM standing.
Although stated below, how to open up the trainer difficulty option is not clear at all for us Zwift beginners.
If you want her to respond to your texts, you need to hook her in with something interesting and funny.
However, those ambiguous openers have their purpose too.
The first part makes her acknowledge you're aware of the classical opener used by almost any guy.
The game does not give you any options while playing.