Hi my wife and I are trying to find her a gf any tips on where to start?
Here is my FAQ page on finding polyamorous people to date.
And here is my FAQ page on couples looking for people to date. It's not clear from your message whether your wife is looking to date someone on your own, but if she is, I would caution you to maybe be less involved than your message implies. Being "scouted" to become someone's girlfriend by her and her spouse can feel objectifying and threatening.
If your wife wants a girlfriend, she should do what any woman looking for a girlfriend does - make an online dating profile, hang out where women interested in dating women also hang out, be flirty and genuine, etc. That's the place to start!