We just moved away after being in DC for 30 years (moved to DC when I was 19). DH was native DC as were both kids. Leaving was sad, exciting, scary and somewhat overwhelming. We moved fast (job offer early Feb, move end of March). I know we forgot to say goodbye to some friends. I feel awful about it, and I'm slowly reconnecting with them. Maybe there was no harm intended but she got caught up in the move. Juggling wrapping up one job, starting another, moving schools, etc. it's crazy. Maybe send her a short email wishing her well in the new home and suggesting you stay in touch. If she never writes back then yes, she's ending but give her a chance, she may have just been crazy busy.