The use of condoms is well documented from the 1560s onwards and was used by the wealthy initially to prevent STDs but later to prevent pregnancy (and was certainly known for that use by by the 19th century).

Dating back millennia there has likely been (it is a matter of some historical contention) a tradition of contraceptive and abortifacient herbs that were relatively common knowledge among sex workers as well as practiced by medical experts and "witches".

Outercourse was also a common practice and was what you might call the "standard service" for sex workers throughout much of the medieval period, primarily intercrural sex (between the thighs), while still practiced it's popularity had reduced by your time period as a result of better alternatives becoming more easily available.

Throughout Lola Montes' lifespan there was a significant cultural war occurring on reproductive rights as the Malthusian League and early feminist movements advocated for legalization of contraceptives and defended those who published books on how to prevent pregnancies though such texts had circulated covertly for a long time previous.

In summary there was no shortage of methods though they were significantly less convenient than modern contraceptives and a successful and relatively wealthy sex worker like Lola Montes would generally not have trouble finding viable methods.