She was probably using hair extensions when there wasn't the technology that we have today.
Keratin bonds are the cutting edge of hair extensions because they do not damage natural hair whatsoever and blends in perfectly with your natural hair. (But make sure it is Remy System hair to ensure 100% quality)
Remy System is when all the cuticles are facing the same direction (downward), the same way your natural hair grows. If it's not Remy System, then the hair will tangle very easily and become a "rat's nest" within a day.
But beware, Remy System is not the same as Remi system. Many brands try to trick you having their name "Remi" when the hair isn't actually Remy.
The top brands right now are Great Lengths, Hair Dreams, and the less expensive (about 1/3 of the cost of the top brands without sacrificing quality) Tony Odisho Extensions.
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