Yes, she can use a massage gun, but keep it gentle. It’s better to use it on the muscles around the arthritic joint rather than directly on the joint.
For eg is there is arthritis for knee joint then you can use it around the joint for thigh or calf muscles but not directly on the knee joint.
Next Steps
Start on the lowest setting for about 30–60 seconds and see how she feels. Stop if it causes pain or discomfort.
Health Tips
Avoid using it over a swollen, hot or very painful joint, bones, or any wound. If she is on blood thinners or has osteoporosis, use extra caution. If you have any concerns or if her symptoms worsen, you can contact me for further guidance.