Sometimes if a doe's udder and teats are that big it's hard for the kids to get a good hold on the teat. Especially if there's only one - the mom is going to look as though she's bursting and the little kid only takes/needs about 2 oz every few hours for the first day or two.
I'm with Free - get her the BoSe. If, at worse case scenario, no one is getting back to you, some feed stores carry a Selenium paste but it's very harsh on their throats. I've never used it myself, but in a pinch it could come in handy.
Keep milking your doe as well and be sure to mark the date on the bag as to which day the milk is (day 1, day 2, etc) so you know the extent of the colostrum. It's easiest to freeze it in 2 - 3 oz baggies since that's about what kids need per feeding their first few days.