As of 2017 she doesn't seem to spawn anymore, at least not on regular servers. Same goes for the Highpass Hold merchant going by the same name.
Edited, Sep 11th 2017 6:47pm by Drewinette
You say, 'Hail, Wyle Bimlin'
Wyle Bimlin says, 'Greetings, fine friend! I bet you are in need of some fine tonics. Feeling a little low? Take a drink of my fine Zap Doodle Tonic. It will give you the energy of five hill giants! You are in luck, my friend! I have it on sale today, and today only. Matter of fact, the sale ends in five minutes or five footsteps, whichever comes first. So don't be down... get an upside-down frown with my Zap Doodle Tonic! All sales are final.'