It will affect Gothel, of course. Even a single strand 你 cute from her hair.. BOOM! GOTHEL IS AFFECTED AND TURNED OLD! Even though how long 你 cut it, it will still affect Gothel, remember that time when she was still a baby? And I don't think Rapunzel's hair will be long again. When she was still a baby, the strand Gothel cut from her hair never grew back.