Sorry, no suggestions as to which would be better for her, but I do remember reading this about LX, in case it matters:
“WARNING: Because of the mild anti-estrogen propeties of 7-OH™ , use of this product by females may decrease the effectiveness of oral and transdermal contraceptives (A.K.A. “The Pill� and “The Patch�). If you normally rely on oral or transdermal contraceptives as your only method of birth control, you should use an additional form of birth control, such as condoms, to help prevent pregnancy while using this product.�