Sounds like someone is doomed to a life of variety.
While some agencies might have higher turnover than others, I think they all have fairly high turnover. It's the nature of the business. Even if the lady doesn't reappear at a different agency, look on the bright side: maybe she found a different calling. Such was the case with one lady who worked at a different agency who I would have repeated with. I miss her, but I'm glad for her.
On a separate but related note, I've always generally wondered a bunch of things about turnover at agencies. For instance, for those girls who adapt to the job, how long do they work on average before they leave for good? Of those who leave for good, how many return to the biz at least once? What percentage of new hires develop cold feet on their first appointments and decide it's not for them? What percentage of debutantes last a week, month, year? I guess you could also ask similar questions about hobbyists (I made it through my first year).
While I'm sure agencies would like to keep most of their girls for as long as they can steadily book them, I'm not so sure they lose much sleep over the high turnover because high turnover means a constant infusion of fresh meat and fresh meat sells. Only a handful of SPs are OMG quality (the holy trinity: looks, service, and attitude), so if an owner loses one of his run-of-the-mill girls, it's not necessarily going to be difficult to find another run-of-the-mill girl as a replacement. Losing an OMGSP, though, could be quite a hit, so I'd conjecture that owners do what they can to keep them happy (i.e. priority booking, select clients, bigger cut, more flexible schedule, etc.), but again, there aren't that many of them.