Are you serious? There are many reasons why one mightn't speak out at the time. I'm going to jump to the major conclusion that you're male and have never encountered a situation like this before. If you were female, with all the different social expectations that have been embedded in you since childhood, you might have a different perspective.
I do not think she is arguing in favor of her "limitations". You are completely missing her perspective. The way you seem to value assertiveness is a typically male perspective. The female perspective often devalues assertiveness and instead values community and acceptance. Why should she have to assert herself? Maybe the burden should be on the other party to create an accepting environment.
This is a very culturally biased view of what "professional" means. You would probably get a different response if you were to go outside America. (this is more an argument against the "no exceptions" part of your point above)
I'd like to know how you could have a full female perspective without being female. Let me know when that's possible! I'd love to be able to have a full male perspective about things!