Here is how I see this...
Maybe there is a communication issue here. Advertising that for 3/4 of her time she only sees established clients actually means that she is good enough that her business constitutes in 75% of repeat clientele.
It ALSO tells you that she CARES about her regulars enough to give them priority over new clients. That is actually pretty impressive IMHO. A provider with 25% of leftover potential of business growth could be growing her business month around, despite her regular clients' needs for appts, yet, she reserves only the last week of the month to expand her business.
Unlike a few have said, she does not sound like a desperate provider to me... She sounds like a woman with a established, solid business; someone who understands that regular clients are the lifeblood of this business and, from what I hear, a woman who shows her men a great time. She is also one of the most professional providers I've had the pleasure of communicating with here. Fast to provide references, direct, and protects her clients privacy.
Like many have said, I would encourage you to became part of her regular list. She is a sexy one.
Yours...
Camille