to think that the lady did not respond due to your ethnicity.
Maybe, she didn't get your information. Maybe she got it and deleted it by mistake. Maybe she ___________. Well, you can fill in the blank with lots of possibilities.
To go right to the "race card" is very presumptous on your part.
Most ladies state on their website whether or not they wish to see "men of color" or not. Did she have any such language on hers? I ask since you said you filled out her "screening form" and I am thinking by that description that you were on her website.
While it may or may not be true (only the lady knows for sure), you mentioning this is simply going to open the door to start the firestorm.
While I consider myself colorblind, I know that prejudices are still around. I don't like it anymore than anyone else, but I have learned to live with it nonetheless. It really is a sad thing.