My cycles are much lighter if not void while on var. No worries - just enjoy ;-) She may find that they are a little off when she goes off her var cycle and that her side effects worsen for a month or so (cramps etc.). It is so different with everyone. I'm sure she has a good sense of her body and she will know when something is wrong.
Timing is different for everyone. Within a week I see stronger definition in my lower abdominal region. Other than that it takes some time. My first cycle took much longer to see anything too different but I had huge strength gains in the gym pretty quickly which led to muscular improvement even off cycle. I have done 15mg cycles, 20mg cycles and now stick with 10. No difference other than less side effects.
Make sure she listens to her body and keeps her diet super clean. You can't get results without the diet.
Good luck....