Check this link. It will tell you how to request Verified Provider status. When you are approved you will be able to post in ad forums.
You may post an ad in Welcome and Introductions, one time. In the Provider Ads forum please read the first three threads. One is the link I gave you. The others are concerned with advertising rules. Ads (including Welcome and Intro) may not contain fees or mention sexual services.
Welcome
Torito
The same way you just did. She would need to pick the New Member welcome section in her local area and put up an introductory post.
There is information in every advertising forum across the site on how to obtain Verified Provider status where she can place regular weekly ads and create a showcase. Everything starts in her local areas forums.