Shouldn't Claire, who is always whining about being weak, have more abilities?

Given that her gift is essentially the same one that Wolverine has? Heh.

Rapid Cellular Generation.

Which means she should have increased agility, stamina, strength, speed, senses, thought processing, motor control and so on that would go along with such a theoretical medical condition that didn't allow injury or growing fatigued and so on. She should, in theory, have the peak human physical and mental condition in every area.