Yes if your losing leafs in flower daily, there is something going on thats not right, even is she has alot of leafs, this shows a sign of a plants health, lush green, (or whatever strain your growing ) but i would check your what your feeding, and your soil. Some other the coutner feeedr 6 months on their own, damn pellets! Making overfeding a common problem in new growers mainly miricle grow...anyhow to directly answer about trimming, i personally leave my alone unless i see something wrong i i ususally will only take off the section that has a spot or watever the problem may be, and if you do this make sure you use a clean blade or sissor, i have a pair thats all i use them for, and like everyone said never cut up during flowering, you do not want to stress her and if you growing good you should be able to make hash
.......that being said im not saying my answer is correct, everyone will tell you something slightly different, thats why we have sites like this, riu being by far the best and only one i use!! Good day my friend and good luck! Just keep learning!