I second Singapore and Aleks. If you and your DD prefer workbooks and pencil, then I'd say go with Singapore. If you think working on the computer would be better, go with Aleks. Both are very well-liked by parents of GT kids and are reasonably priced.
Also, you might want to look at Singapore's harder workbooks, like "Challenging Word Problems" or "Intensive Practice." They offer significantly more challenging problem-solving work (some of the problems even made DH and I scratch our heads a bit, and he's an engineer!), even though they don't require higher level arithmetic skills. That's good for HG+ kids who can handle the concepts but don't have the full arithmetic toolbox at their disposal yet. (i.e. my DS6 understands multiplication conceptually, but he has yet to memorize the times tables.)
http://www.singaporemath.com/Default.asphttp://www.aleks.com/independent/students/getting_startedAs for DYS, I think it is extremely hard to show "work" for a child in K-2ish. My recommendation: film your child doing her thing! I didn't submit video, but if I'm asked to provide more evidence, that's what I'm going to send in!
Please do remember that you need to distinguish not between an ND (normally developing) child and a GT one, but between an MG child and an HG+ one. Try to show that your DD is at least 2-3 grades minimum beyond her age level, and more is better.
Is math her strongest area? I'd focus on whatever she's most obviously GT in.
As for Bloom's taxonomy, I think the idea is to show that she isn't just memorizing facts, since that could be the result of a hothousing parent instead of an HG+ child. You want to show that the child thinks at a higher level--deeper, with greater sophistication, with greater ability to use what she knows--then other kids her age.
Does that help?