So as the title states I am missing my follower piper. She went missing after I sent here to Spectacle Island I have tried using a bell to find here but she never walked to the bell. In case this helps she was last in power armor. Does anybody have a viable solution for me?

If you are on the PC, then type player.moveto 2f1f. If you are on a console, then you are stuck with loading up a previous save or searching for her the hard way. It is possible that she was sent back to Diamond City since some characters have their own home base.

Try sleeping in a bed and see if she appears.

She stole some power armor of mine one time and I figured I'd try sleeping in a nearby sleeping bag to see if she would get out and she did. Maybe something like that will trigger her to appear and get out of it.

hth.