I've had a couple kids by our chocolate buck do that too. Most recently we had a kid born a dark chocolate chammie and now at 3 months she's cream and dark gold (where her black shading would be if she was a regular chammie.) At birth you almost couldn't tell she was anything except a regular...
A wether can be a great companion for a doe or buck. Just be aware that when your doe is in milk that their nutritional needs will be vastly different- so you'll have to separate them for feeding. But if you ever add another doe and a buck in the future your wether can keep your buck company.
She's fighting you because she raised her kid. Some does tolerate this, some don't. One of our first milkers was a BEAST to milk the first year because I dam raised. The next year, I pulled her kids and she bonded with me instead. Then all I had to do was let her out and she'd run to the...
When my bucks aren't getting much alfalfa (they're getting plenty right now because they're in rut and burning calories) I pull the stems out of the doe feeder and give them to the bucks. Because their alfalfa is limited and they don't have a choice about picking out the leafy bits they snarf...