Most Helpful Girl
I think it would be nice to message her and let her know you're not interested. It would hurt her but that's better than simply ghosting.
Most Helpful Guy
Just let her know, its okay you fell out of interest. its not your fault at all. If ask why just tell her "theres been a change of plans on my schedule." Dont mention to reschedule. If she do bring it up jus say. "Not sure when."
If you still want to talj. If want stop talking to her all together. Just let her your schedule will be busy so you won't be on as you used to.