The vets advice was based on his long history with his own companion parrots even before vet school according to him... He says he's got a 47 year old cockatiel (unheard of!) that has been eating mostly pellets his whole life and is fine. Anyways... I'm going to continue feeding a good variety of foods... I just feel better about it. I'll try the apple cider vinegar, thanks. I'm worried she won't get much though because I barely see her drink water.. I'm sure she'll get some though

I knew you'd all freak out about taking her outside unrestrained and what not. I am keeping a close eye on her flight feathers. I've seen her get spooked and fly off to the ground, she still can't get very far at all. I'm super cautious of her current mood and surroundings. If she's acting nervous about something I either stop what I'm doing or take it slower until she calms down. The coffee shop is literally less than 100 meters away and the one street that we cross, I wait well beyond the edge of the street until there are no cars at all for a long time, and then cross.
I realize that taking her outside is a risk in itself but it's no more risk than living life in general anyways, and I feel that the benefits she is getting are more than the possible risks. The coffee shop itself is a very unique place, it's essentially a BIG fenced in yard with bushes and trees and lots of grassy space, picnic tables to sit at, and a covered deck to sit outside as well. There are on average just 2-7 people outside when we go, and I stand around wherever she's comfortable. She actually really likes being around people, as long as no one is scaring her or doing something she doesn't like. These people are all people I know for the most part, as the whole compound (which includes the coffee shop, fenced in area, and art gallery) are owned by friends of mine. It's arguably the safest place I could take her outside my home at the moment in order for her to glean the benefits of socialization. Also, while we're in there, there's absolutely no possibility of her getting out to the street where the cars are.
I do plan on using a harness soon, I'm just trying to introduce new things slowly enough that she doesn't get overwhelmed. When her flight feathers grow in more, rest assured she will not be outside unrestrained.
In summary, I realize it's a risk, but I feel comfortable with it right now. My attitude mostly comes from seeing it in action, the parrot that my dad currently has is apparently very happy and healthy as far as we know, and I think it's mostly due to the fact that she spends the majority of her life out and about (no cage or harness, is clipped though). She goes everywhere and really really enjoys it.