ester
Not slacking multitasking
correcting pigeon toes in a 22 yo horse (or in any adult horse) often causes problems as it's established.Try a different farrier to correct it
OP at the moment you just don't have enough info to be making any sensible decisions for the future and your options differ if she is experiencing arthritis in one joint or multiples. It's great that she is currently happy in herself that's a good starting point!