Hey buddy, when you are still friends with her, why miss the fun?
It would hurt her if you go without her and with her friends!!!
The best thing for you is
to message her and ask if she's going on the trip
if she says yes, ask if she is okay if you join the trip
Most likely things might settle down and you guys can reunite. Redoing the same trip means you relive the same happy moments again and it might REALLY mean something for both of you. You can talk about the last trip, new happenings in life and future plans.