Good points by Don; the most important vocal education you can get from good "in-person" voice lessons transcends genre, and simply helps you find your most natural approach, the best manner by which to maximize your own potential. An experienced voice teacher (perhaps "vocal coach" would be a better term) can observe and listen, detect anything the student might be doing "wrong," and offer practical advice.

Ana seems to have already gotten some formal voice training ~ maybe enough to have internalized everything she needs to know about using her own voice without undue strain, maybe not.

What she seems to be looking for is guidance in perfecting her style, to sound as "traditional" or "authentic" as possible. I'm not sure there's any alternative to "imitation" of the singers she most admires; the problem is defining who and what to imitate, and where and how to achieve access.

I wouldn't expect classroom lessons to be available, at least not very helpful ones. For someone with the time and money, the ideal solution is probably "total immersion": Moving to some rural outpose in Ireland or Scotland where one's chosen tradition is alive, where oldtimers and their more serious younger friends sing away the hours in local public houses, and where one can hopefully, gradually, become part of the scene.