I'm unsure if it is too late or not, I'm thinking probably yes she is too old.
I have a hen with bent toes, almost as bad as in your photo. She manages just fine, just like any normal hen, she can roost, run, scratch and she is my best broody hen. She is 2 and a half.
I have an ameraucana whose toes were straight, up until about week #6. One day i noticed she had a toe which was severely bent and “arthritic“ looking. Too late to intervene, she is now going on 2yrs old, and it hasn't hampered her one bit.