https://en.m.wikipedia.org/wiki/Oaxaca
"Oaxaca is located in*Southwestern Mexico.[10]*It is bordered by the states of*Guerrero*to the west,*Puebla*to the northwest,Veracruz*to the north,*Chiapas*to the east. To the south, Oaxaca has a significant coastline on the Pacific Ocean."
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"The state is located in the south of Mexico, bordered by the states of Puebla, Veracruz, Chiapas and Guerrero with the Pacific Ocean to the south. It has a territory of 93,967*km2*(36,281*sq*mi), accounting for less than 5% of Mexico's territory.[27][28]*Here several mountain chains come together,[16]*with the elevation varying from sea level to 3,759*m (12,333*ft)*asl,[28]*averaging at 1,500*m (4,921*ft) asl.[16]*Oaxaca has one of the most rugged terrains in Mexico, with mountain ranges that abruptly fall into the sea. Between these mountains are mostly narrow valleys, canyons and ravines. Major elevations in the state include Cempoaltepetl (3,396*m or 11,142*ft asl), El Espinazo del Diablo, Nindú Naxinda Yucunino and Cerro Encantado.[28]*Oaxaca's has 533*km (331*mi) of coastline with nine major bays.[12]"
*more at link
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"The state has a total population of about 3.5*million, with women outnumbering men by 150,000 and about 60% of the population under the age of 30. It is ranked tenth in population in the country. Fifty three percent of the population lives in rural areas."
In the article I just posted above, her husband said she enjoys hiking. I wonder if she might have planned a hike along the way to Cancun, or had planned to go there directly without stopping. The Wikipedia link also mentions some National Parks:
Lagunas de Chacahua National Park
Benito Juárez National Park
Huatulco National Park
Tehuacán-Cuicatlán Biosphere Reserve
"The state has a total of 18,933.4*km (11,764.7*mi) of roadways. Most of these roadways are in the Papaloapam, Mixteca, Isthmus and Coast Regions.[65]*The primary highways in the state include Oaxaca (city)-Cuacnopalan toll road and the Pan-American highway, which crosses the state completely from Puebla to Chiapas.*Federal highway 200*hugs the coast connecting communities such as Puerto Escondido, Salinas Cruz and Huatulco with Acapulco and Chiapas.*Federal highway 185, also called "Transístmica," crosses the state from the Veracruz border to the coast at*Salina Cruz.*Federal highway 125*runs from the Puebla state line along the western part of the state.*Federal highway 135*leads from Puebla to Oaxaca City then down to Pochutla.*Federal highway 175runs from the Veracruz border to the city of Oaxaca. Other highways include*Federal highway 147*and*Federal highway 182.[66]"
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Local transportation services
"Local public transportation is offered various local business using pickup trucks, buses and small cargo trucks.(eumed) Oaxaca city has separate first class and second class*bus*stations, offering services to most places within the state of Oaxaca, including the coastal resorts of*Huatulco,*Puerto Escondido,*Puerto Ángel*andPinotepa Nacional, and also long-distance services to*Puebla*and*Mexico City*and other Mexican locations such as*Veracruz. Intercity bus services is provided by companies such as ADO, Cristòbal Colòn, SUR, Fletes y Pasajes and AU. Smaller providers provide service in vans, especially between the city of Oaxaca and the coast. These operators have existed only semi-legally in the past but legal issues have since been resolved."
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There appear to be an infinite number of Tourist Attractions:
*See Landmarks and tourist attractions
*As I mentioned before, I am afraid this is an absolute needle in a haystack, as far as me sleuthing from the states is concerned. She literally could be anywhere, and if she got in the car with the wrong person....I feel powerless and helpless. I hope that the PI/authorities/agencies/government(s) can ascertain just what happened to Jenny. This will be a very tough case, I think.