but now you know that you're NOT a favorite client of hers...sorry

If you see her again let her know before the session that you saw her ad and just want to "confirm" that the new rate is XXX.

If she balks...run...run very fast.

This is simply a business...conduct yourself accordingly.  Would you pay $ 1 a gallon more if the station across the street is selling it for the $ 1 a gallon less?

You don't owe her anything...except the donation in her ad/site.  And if she plans on jacking you up for more, and you go along with that, you better examine why you're here in the first place.

...you more than a stranger who she's never seen before?  Listen to CPA - he may seem cold and purely about business but if you think about it, that's what your "favorite" is doing.  This is a business to her; if she can get one client to pay more than another for the same product, why wouldn't she do it.

Giving her the benefit of the doubt, maybe she forgot to tell you about the lower rates but it's more likely that she thinks you won't look at her website since you're already a steady customer.  Mention it to her!

So, are you saying that you saw her, and later saw that she had a different rate on her new ad? It is possible that she is running specials(it's a holiday weekend, & some ladies run specials during holidays). Or, it is possible she posted the ad after your appointment? Or was it there prior to the appointment, and you're wondering why she did not inform you of the cheaper rate?