I agree totally with Mastodon. I don't think it would be weird at all. There may have been an impediment to her telling you she was leaving and indicating that you could follow her to her new practice. Doing that might have violated some understanding between her and her old employer. I had a therapist once who was leaving where I was getting treatment and who told me where she was going to. Since you found out on your own, there would be no ethical or etiquette barriers to you seeking her out . . . none that I know of.