I do not know your trainer's background (and I am NOT a nutrition or strength training expert by any means, though I do have a PhD in exercise physiology) but unless you have a goal of being a body builder/power lifter/etc. I would say she is being overly dramatic. I did a 5 minute search just because this interested me, and a review article from 2013 suggests that muscle protein synthesis does increase with protein intake, but plateaus at 20 grams of protein. So yes, you do need to consume some protein, and 20+ grams is fine if that fits into a healthy diet plan for you, but you would certainly still be able to build some muscle with less than that. If you are happy with what you are doing and it is working for you, then keep doing it! But don't feel guilty or like you are wasting your time exercising just because you may have only gotten 10-15 grams in sometimes