Clen is strange that way. If your CNS is non-responsive you'll actually become tired with clen use, this happens in about 10-20% +/- of users. Majority of the users will get hyper and jump up and down

, but a minority will almost have the opposite effect. I've seen this a lot in women. Keep in mind, just because you're not jumping off of walls, it doesn't mean you're not getting results

; she'll still burning fat.
Your basal indicator should be her temperature, what was it before she started clen? Right in the morning when she wakes up (opens her eyes), before she gets out of bed or does anything, measure her temperature. Do this for 10 days and take an average, including high-low. This way you can see how her basal metabolic rate is, and you can use it as a basis for her responsiveness to different stimulants, diets, training regiments and even cardio.