Well, here is the point of view of one mixed child:
For years I agonized over my hair and the perception that it has to be tamed and subdued.
Now I let it be natural, curls and all....
First thing is to realize that "their hair" is really your hair and his hair. In this age of so much skin and haircare knowledge it would be unlikely that your daughter's hair would reach the point of becoming 'nasty'. Added to the fact that you seem vigilant about taking care of any hair issues.
Your daughter's hair may be either straighter or curlier depending on which gene is more dominant. Either way, I am sure you will love her hair.
Here is my 2 cents on how I take of my hair:
I wash my hair and condition it constantly. Any kind of frizz control product is good - Frizz Ease is good or any curl conditoner product. Another great product is Redken ringlet 07 curl perfector. Curly to kinky hair tends to be dry at times, so I use a glosser and Infusium which has panthenol to give hair a smoother texture.
For kids with curly hair it is important that you resist the urge to straighten the child's hair with a chemical relaxer - this could permanently damage the hair.
Later when your daughter is older, you can take her to the hair salon to have her hair blown out straight or set on hair rollers which gives controlled, beautiful curls.