Besides those with a Thai Spouse, there are those who have been on Thai Retirement Visas/Extensions (Non–O over age 50) and switched to DTV (Medical Care) or on Non–B Visa/Extensions and switched to DTV (Remote Work)....
As long as you have a solid course/plan of Soft Power activities detailed for the future (and accompanying documentation) as determined by the specific Thai Embassy/Thai Consulate, not the only or first person to be Non–O (married to Thai Wife) Visa/Extensions and switched to DTV....
Which Thai Embassy/Thai Consulate (Where) did she apply and receive her DTV Visa from??
From what you have described, it sounds like she received a DTV E–Visa and the PDF File from the Thai Embassy/Thai Consulate is her DTV E–Visa
However, if the actual scenario is that if she received a DTV Visa Sticker inside her passport, then that is very unfortunate and that DTV Visa Sticker was her Thai DTV Visa