Puppies chew! It's just what they do.
Next time she does it, you need to redirect the behaviour onto a chew toy or a bone. Chewing is good for them, and their teeth when it's a bone or a toy designed for that, and it's just something dogs do, especially as pups.
Redirect the behaviour onto something else designed for chewing, and do something for her to associate chewing the hose (or whatever it is she shouldn't chew) as not a good thing, eg a squirt of water, unless she likes that, or just a "no!". Or put some bitter apple spray etc on the hose, she'll soon learn she shouldn't chew it.
Good luck!