Congratulations on the new baby.
I can't offer any solutions on the bleeding part, but I can help you with the milk replacer.
If you want to give her anything besides goat milk, you will need to add a few things.
This is what I use if I don't have any goat milk available.
If using calf milk replacer, To 1 gallon of prepared milk replacer, I add 1 raw egg and 1 cup of buttermilk. I also cut the recommended dose of the powder in half.
If using whole milk, I remove 3 cups from a gallon of milk. To the remaining part of the gallon, I then add 1 raw egg, 1 can of evaporated milk, 1 cup of buttermilk, and add water to make a full gallon. (Sometimes I take out more than 3 cups)
If using goat milk replacer, cut the recommended dose in half. (I prefer Uni-Milk) I usually add an egg to each gallon I mix.
I only bottle feed a maximum of 3 times a day. I start with 8 - 12 ounces per feeding depending on the size of the kid. I don't recommend you feed her until she is full, only until you can see her belly rounded out some. You will have to adjust the amount by watching her. If she quits nursing before she drinks the entire bottle, next time feed her less. I gradually increase as they grow to 16 ounces.
You can easily over feed a baby and they can bloat.
It is hard to explain this in writing, but you want to leave her wanting more. I don't mean to deprive her of milk, just don't fill her up. She needs to be active after drinking, not ready for a nap. Her system is not made to be full, if she was nursing from her mother, she would only be allowed to nurse for a very short time before Mom walks off.
Watch for diarrhea, if she has really loose bowel movements, you could either be giving her too much, or the mixture is too rich.
Her bowel movements should be kind of sticky, but not hard pellets at her age. More like a young puppy.
You may need to adjust the mixture until you find the right one for her.
Have hay and fresh water available for her.
As far as her shaking her back legs, I'm not sure exactly what you mean.
Does she do this all the time, or just after a bottle? Does it seem like she is in pain, or is it more like she is shivering?
Baby goats fall down a lot, when they are being frisky. They just aren't the most graceful things while they are "finding their feet".
I hope I have helped you some. I wish I knew what is happening to your baby.
Jean