The Dumor is fine. I have used it, but sometimes it can be powdery, it just depends on what your particular bag is like. Many things Ihave read say to only use aspirin for 2-3 days due to a risk of causing intestinal bleeding, but I think some use it longer. Vets have other medicines to use if that is possible. Her ankles look a little thickened which might be arthritis, even possibly mycoplasma synovitis. Are her hock joints swollen? I would let her out with her flock each day for a supervised period, so that she doesn’t get bullied after being gone too long.