Have you read this?
http://www.elitefitness.com/forum/showthread.php?t=302279
Anavar has not usually affected my sex drive. Any sex drive increase I attribute to increased self-image and the increase that typically comes with working out.
Doses are low, start low and slowly increase up. No female NEEDS to go past 10mg. More Var isn't the answer there, better diet is. The average female (non-pro competitor) should see AMAZING results at 10mg if training is good and diet is CLEAN and very very high in protein.
Start at 5mg, stay there for 3-4 weeks, then increase IF NEEDED.
Cycle can go as long as you'd like and your liver allows.
Some females have stayed on for 6 months. Longest cycle I have done is 12 weeks.
Females do not need PCT.
Sides with Var are typically mild....mostly just some pimples and oily skin.
BUT, of course, everyone is different.
Don't go with whatever is cheapest and/or whatever is available. Be smart about what she takes. Only use reputable sources and brands. Don't fuck around, she has very little "wiggle room" or margin of error. Wait for what is right for her.
AND...get her on HERE for her own research!