Urgent question: female surgeons in the Roman period?

[Martin Moser]

Andrea Rottloff mentions in her book "Lebenbilder römischer Frauen" the following about female physicians:

Generally the term "medicus" was not as strictly reglemented as it is nowadays the "physician" therefore there could have been female quack doctors as well. All female doctors were free born women and not slaves.

And how would she prove this? :-) ) We know that slaves were educated as doctors in order to serve as the "family physician" and that some of the doctors were freedmen (who may have learned their trade while still being slaves), so why should this have been different for women? Or does she mean to say that we dno't know of any inscriptions etc. of the like?

More on slaves as doctors:

Kudlien, Fridolf: Die Stellung des Arztes in der römischen Gesellschaft. Freigeborene Römer, Eingebürgerte, Peregrine, Sklaven, Freigelassene als Ärzte. 1986. Forschungen zur antiken Sklaverei, Band 18. ISBN 3-515-04698-4.