NO!
Seriously, she can understand no. She is putting together what is okay / not okay at this time. She is seeing what she can / cannot do. Not a testing, like teens will do, but more of an exploration.
Try thinking like a 14 month old. She doesn't have any real knowledge of the world. There's these little things on the walls with holes in them. I wonder what they do or where the holes go to. I mean, I see a hole on the ground and there are little bugs that come out. Maybe this is where little bugs live... I'll stick something in there to see if they will come out to play.
Crimeny! That got a major reaction outta Mom!!! What the heck is she jumpin around like that for? Her arms went swingin and she came running towards me. OMG! She looked really funny! I wonder if I can get her to do that again. Let's see... What did I do to make her dance like that? Oh, yeah, I remember...
See? Bean doesn't know what all this is about. She knows she explores something and you react. Sometimes your reaction might make her want you to do that again.
She understands when you say "NO" you want her to not do something, but gosh, that dance was really funny. Who could resist? She understands that she doesn't want you to yell, or say she can't do something, but she's really just trying to figure out her world. (We all know this is Beans world and she's just allowing us to live in it, right?)
Basically, she's exploring. She doesn't know about gravity, or that glass will break or that the holes in the walls will "bite" if you stick something in them. But, she's learning.
Maybe you could switch from "No" to "hurt."
When she goes to pick up something fragile, tell her "This will break. We don't want to hurt it." When she is getting ready to do something that may hurt her, say "That might hurt you. We don't want you to get hurt."
Kinda depends on the language you already use with her. If you say booboo instead of hurt, and she understands booboo, then use the word she knows.