Hello, it's good to know that you understand about her Prakruti and her pain which is due to the aggravation of Vata. For immediate relaxation you can apply Myostaal liniment on the joints and ask her to stay warm. In diet, ask her to avoid Vata aggravating foods like potatoes, pulses and grams.
Next Steps
However it's better you can consult an Ayurvedic physician and start with therapies along with internal medication, further to which she can maintain with help of dietary changes, medicine and yoga.