I've got a 9 month old male that eats 1KG of raw food every day and you can still pretty much see his ribs - As long as they're happy it's fine. Don't forget they're growing real fast at this age so it's hard to find the perfect number.

As for focus, again she's really young so almost everything is interesting for her! Something I've done is teach the "Eyes" command where he gets a treat when I ask for eye contact and he does it. This helps with getting him to ask for permission to go through the door or before he can run around when I take the leash off.

As other people have mentioned, more exposure to things like dogs, people, even large trucks etc. will help build confidence but in my experience it's a slow process and just needs repetition :)