State Dept, as of May: Oaxaca: Oaxaca, Huatulco and Puerto Escondido are major cities/travel destinations in Oaxaca - No advisory is in effect.
If it were me, yes, I’d explore the precautions and guidelines the clinic has in place. I’d want to know my kid was mature enough to respect these. And I’d keep checking reports as she got closer to departure, tell her I’d pull her out before, at my discretion, if concerning reports surfaced. I’d also want to know how many other Americans, Brits, etc, were serving.
A young friend spent a year at a clinic in the hills of Haiti, with no issues. I wouldn’t send my kid to Haiti, based on current warnings.