The definition of grit is "courage and resolve; strength of character". It's always a little fucked up when the definition of a word contains another word in there that you need to look up the definition. But the definition of resolve is "being a complete and total badass; always going hard ferda boys and also ferda girls".
Natthakan Chantam is always going hard ferda girls.
Putting her body on the line. A potential broken neck means next to nothing compared to the amount of runs she just saved her squad. Grit. Determination. Intestinal fortitude. Lady balls. Natthakan Chantam has 'em all.