I really think you should lay off the clen then in this case. I'm sure you've read above but clenbuterol will start losing its effectiveness after 2 to 3 weeks without a beta-2 "refresher" along side it (ketotifen)
At your current weight I honestly don't think you would notice a huge difference in adding this to your routine, although you could see some. I think clen is best used to get rid of the last few lbs the diet and exercise just can't seem to rid you of.
Is your diet clean? and are you currently dropping weight with what you are currently doing at the moment? Low carb it, high protein, etc look into your macro's make sure it's all where they should be. Once you hit a wall and stop seeing results THEN add clen or ECA stack (ephedrine/caffeine/aspirin)
As far as building muscle goes. Women do not have the hormonal capacity to natural get bulky ESPECIALLY while dieting and STRONGLY recommend throwing more of the weight around in your routine. You will see your body tighten up and get more toned because of it (more muscle used also means more cals burned).
Resistance weight training has been shown to burn more calories through out the day than a session of cardio. Also the more muscle your body puts on the more energy (macros) it will need to maintain itself. That means your body will burn more fat.
Cardio work your cardiovascular system (heart lungs) It does help with weight loss, yes, but it is most beneficial when combined with proper diet and exercise routine. Once and if your at this point, then add clen. You will then really see it shine in your use of it.
=)
