As an attempt to squash all hair related rumors, her camp released a video showing the entertainer getting feed in cornrows. If a person suffers from a shortage of hair around their hair line, it's wise to insert the right amount of hair that will hold the cornrows in place.
Here is a picture of Beyonce getting feed-in cornrows. There's a reason why her cornrows are smaller around her edges. Less hair is always added to ensure that the braider is able to grip and hold the cornrow in place.
It's a bit funny that the camera didn't film the insert of braids at the very beginning. Instead, filming took place near the very end of the braiding process.
Beyonce will never hang up her collection of weaves or hair extensions and if you take a look at the actual video clip...you will see that the shape of Beyonce's cornrows are different (as in bigger than the ones displayed at point 0.26). It also reveals that there were two people getting their hair braided and Beyonce's voice was used while the second person got their hair braided. Smaller feed-in cornrows shows that the braider had less hair to work with. If a person has a lot of hair...well the braids will appear a bit full.