@rundocuri- You were right to tell your friend not to attempt to drain her tooth abscess on her own. Just like the article says, this can be dangerous and can make an already serious problem worse. If your friend doesn't have the money to see a dentist, there are other options available.
The first step that your friend should take is to see if there are any low-cost dental clinics in or close to the city where she lives. Many communities have these clinics that provide basic and emergency dental care at reduced prices.
If a low-cost dental clinic is not an option for your friend, she should check with dentists in her area to see if any offer payment plans for their services. With the rising costs of dental care, many practices offer these services to patients who can't pay their bills all at once.
Finally, if your friend's tooth abscess infection is very bad, she should consider visiting her doctor or her local emergency room. Though this won't correct the entire problem, it will allow her to be evaluated by a medical professional and get medications to treat her infected tooth. She may even be able to get a referral to a dental clinic that can help resolve her problem.