Female equivalent of "man up"?

So my current MC is a tomboy who regards emotions as a sign of weakness even when they concern her possibly-terminal mother. She tells herself to... well, something resembling "man up" or "sac up". At the moment, I've got "grow a pair" (lots of things in AFAB people come in pairs, right? Breasts, ovaries, fallopian tubes...) but I don't think that's the best phrase. I just can't think of a better one (and am not entirely sure there is a better one, but it can't hurt to ask, right?).

Female equivalent of "man up"?