A typical dilemma of whether to travel or not, if not getting a confirmation on the day.
Personally I would not set off without on the day confirmation unless I already had a good relationship with the sp. Especially if it was out of my way.
I feel a neutral is fine if being ghosted on the day, with no comms at all. It's not her fault that the OP travelled. She should of course be proactive and tell him it's not going ahead, but everyone knows if they don't respond to you on the day, that's the reality. Of course in many cases they may not even switch their working phone on if they've decided not to work, especially if juggling the job with civvy life.
If you get confirmation on the day, then ghosted on arrival, that's definitely a negative.