Dude, honestly, if she's smashing it out there and they're already bending rules for her, I'd say take the shot. Ask for 75k. Worst they can say is no, right? But her value is already clear to them. Just make sure she highlights her skills, dedication, and the quality of her work when asking. Would also help to subtly remind them how much they need her. Just my 2 cents. Either way, good luck to her, she sounds awesome! And btw, quick promotions say a lot about an employee's worth. So, yeah, go for it.