puppy bad behaviors-take her or leave her-HELP

Question:
 We just turned our 8 month old boxer mix puppy back in to the agency we adopted her from 7 months ago and we are having regrets. We made the decision after she lunged at a toddler who got a bit too close to her face yesterday at the park. She didn't hurt the child, just scared her, my daughter and me. Please note that she didn't do this aggressively (she didn't growl bark or nip), and I truly believe that she was playing with the child and just licked her face. Nonetheless, I didn't want to chance this happening again and anyone being harmed. This was the last straw among many behaviors that have caused my family much grief over the last few months such as: She barks at every little noise (we've been using a frequency-emitting collar), she jumps all over our house guests even long after they arrive, she's still up 3 times a night having to pee. She bolts when we open the door and will run after anyone passing our house. Did I mention, she's chewed up our furniture and most of our baseboards. We keep her in the house because we have no fence on our property. Because of this she comes to work with me and we take her everywhere we can to keep her exercised and socialized. I take her for long walks several times a week to keep her exercised. She's also gone through obedience. Currently my 7 yo daughter is crying nonstop (me too) and the foster family who has our dog now says she hasn't eaten since we brought her there, we all miss her greatly, but fear if we bring her back we'll still be facing the same issues. My question to all of you who read this is: What would you do?
Answer:
 I find it extremely difficult to believe you got this dog at 4 weeks of age from a rescue. If that is fact, then part of the dogs problem is having been taken away from the litter much too young. It sounds to me that you have no experience with dogs of any kind. Long walks several times a DAY are what this dog needs. She is definately not getting enough exercise. Where were you when she was chewing up your house? If she is jumping all over guests that is YOUR fault. Her running off is YOUR fault. If she is peeing that often, perhaps she has a UTI? She should have never been allowed to be that close to any childs face. Obviously she meant no harm. I can't imagine the rescue would allow you to get her back. What will have changed if you do? What HAS changed that you think all will be well if she comes back? You are feeling guilty and well you should. You failed the dog by not training her, not protecting her & not keeping her from doing things that are potentially dangerous to her. Unless you are going to change & take charge of the situation - let her where she is, but please before you get any dog - learn what is involved in responsible pet ownership.
Answer:
 I really resent your reply to my post. I was looking for some suggestions, not finger pointing or to be a sounding board for your unresolved anger! First of all she was dumped over the shelter's fence at 6 weeks to 2 months of age. We adopted her shortly after. No, I've never had a family dog, so I did my research for about 6 months. We took her through 10 weeks of puppy obedience, which was helpful to potty train, crate train, get her to sit stay and I have some experience with conditioning, and have continued to work with her from home. She is a very stubborn and hyper dog and I had a really hard time trying to break her of the forementioned behaviors. As for the chewing, she chewed on a leg of our dining room table while we were sitting at it eating, and a baseboard while we were again right in front of her. We keep a basket of chew toys available at all times for her and I found a natural repellant that is supposed to help, which didn't. Long walks several times a day? Well, if 3-5miles a day, 4-5 times a week isn't enough I don't know how anyone in this world has time to exercise their dog! As for the child, my dog was on a leash and being held by me when this child got too close. I was right in the process of explaining to her mom not to get too close because she is a puppy and she likes to play, sometimes roughly. Now, if you would like to give me suggestions on breaking her of these habits, instead of blaming me for them, I'm open to hear what you say!