Has she ever used it before? When I use Clen, I myself do two days on two off or sometimes I do one on, one off, depends how I'm feeling on it but two days on, two off, seems to be the typical routine.
Now, dosage wise, that's really going to depend on her. A lot of the reading that I've done, has suggested 80-100mcg a day for women but I myself feel pretty nasty on that dosage. Some people can handle that dose, some can't. Make sure you are dividing it up into two dosages, one in the morning and one in the afternoon. Maybe start her with 25mcgs twice a day and see how she feels on it before upping her dosage. Be sure to include Taurine in her supplementation while on the Clen. This will help prevent any nasty cramping that is so associated with Clenbuterol. Hope that helps.

I would reccomend taking it in the afternoon, only because it makes me soo tired!