If her doctor deemed the treatment necessary for her health and well being, then yes. You may also be able to deduct a portion of travel expenses as well.
Here is the IRS web site on allowable medical deductions http://www.irs.gov/publications/p502/ar02.html#d0e628
Example: Weight-Loss Program
You can include in medical expenses amounts you pay to lose weight if it is a treatment for a specific disease diagnosed by a physician (such as obesity, hypertension, or heart disease). This includes fees you pay for membership in a weight reduction group and attendance at periodic meetings. You cannot include membership dues in a gym, health club, or spa as medical expenses, but you can include separate fees charged there for weight loss activities.


