Everything said above. She DOES NOT IN NO UNCERTAIN TERMS NEED STEROIDS.
ESPECIALLY deca. NONONONONONO. Not appropriate at all.
While she is determining to work w/ the Gurus of Paradise or not, so we know what we're talking about, can you post up a meal plan she's on right now, as:
Meal 1: 8 am
4 egg whites + 1 whole egg
1/2 c oats
Meal 2: 11 am
4 oz turkey breast
1 c spinach
etc.
And better, have her load it into a food counts program like
FitDay - Free Weight Loss and Diet Journal to get a real understanding of what she is eating & how it breaks out into proprortions & amounts of proteins, fats & carbs.
As noted above, ALWAYS start w/ diet first. Small tweaks produce big results. Steroids are something that should not even come up in the conversation.
And please for anyone reading this - unless you're an extremely advanced national level female bodybuilder, if someone suggests deca for you, RUN FUCKING SCREAMING FOR THE HILLS. THIS IS NOT APPROPRIATE FOR SOMEONE "who wants a little muscle", and is the last thing I would recommend for a women, unless she's already well-experienced on the dark side.