User blog comment:FairyRaven/Fairy Tail Chapter 346: Retrogression Magic, Review and Commentary/@comment-77.194.131.196-20130802125011/@comment-7418318-20130802125528

Maybe her new guild got the mission to take those treasure hunters into custody and her meeting Lucy-tachi there is just coincidence.

Or she could have been sent to spy on Minerva and her partner.

But if she really did follow Lucy (or someone else on the team) it would have been easy for her to grab on to that tree with her hair magic, hanging from the underside of it and thus hitch a ride without being noticed.