She is an event planner.
While your numbers may be correct, I can assure you that she has access to white men if she does corporate events. If she is good at her job, she does large corporate events and those are comprised primarily of white males. There are a lot of women in that environment but not a lot of sistas. If she had more of a submissive demeanor, she could pull a white guy making six figures in that environment. You have to understand that conventions are nothing but big social gatherings. Even though they are for business purposes, they are still social gatherings and her being in that job affords her much more access than the average female, period.
I see sistas white white guys every day. Its not uncommon out west and not uncommon at all where I live.
That said, I agree that in general they are not checking for sistas, but its possible for her to pull if she has corporate daygame about herself (which she doesn't seem to).
She seems to believe she's on a higher level than she actually is. She wants a "hot" man with a lot of money and she thinks she's in the league to get at them. She's not. Software programmers doing UX or UI all easily make 100-120k a year and there are a ton of them. The problem is that a lot of them look like comic book guy on the Simpsons and she won't "settle" for that. Her ego is her obstacle.