Why Recovery Girl never cured All Might injuries? Supposedly, All Might injuries are one of the reasons he can't last and fight anymore like he did in the past, before the battle with All For One. Why Recovery Girl never cured All Might injuries?. Midoriya many times completely broke their arms and legs, but she was able to completely cure him. Why this doesnt work for All Might?
As Recovery Girl explained her quirk only accelerates a person's natural healing rate with a proportional cost to their own energy. 

So since Deku's bones could heal over time her quirk could make them heal faster, but you wouldn't expect a person to be able heal having a good few major internal organs crushed over any length of time so Recovery Girl can't repair All Might's injuries.