Though cosmetically worrisome, sun spots aren't that threatening, but, according to experts, they are a reflection of considerable sun damage. Excessive sun damage which is not threated on time means there is an increased risk of skin cancer. Because of BCC's direct relationship to sun-damaged skin, I think your daughter will only find IPL photo facial, beneficial.
Is best to discuss this with her dermatologist or dermatologist that is expert in age spots removal treatments.