C.K.
Hello,
I have a 6.5 month old son and he's rolling around and starting to reach for things that he shouldn't be in and my husband does the same thing...just says 'no' in a firm voice (while reclined in the chair) and gets mad when he doesnt listen...I personally think that you are doing the right thing because she needs to know what she's allowed to get into and what she's not allowed to get into (you should put things in a box/container that is ok for her to get into and try to teach her that those are ok) and if you are there to show her what is good and bad by being there and saying 'no' and pointing at what she's not allowed to get into...then I think it's a more effective way of teaching/discipline. Example: My son will pull on my hair as soon as I pick him up and I have repeatedly told him 'let go' and slowly/gently get the hair out of his hands and over time when I just say 'let go' in a mildly firm voice...and now is starting to understand -he knows to let go of my hair...I also try to tell him ...'nice hair' and make it so he is learning that it's ok to touch, but just not pull.
Hope that helps...first timer here too!