I think she made it clear in posts after the original one what she meant was "whether she admits to it or not," not "whether she asks for it or not." Unfortunate wording.
In any case, I think it's quite common for people, male or female or whatever, to enjoy being submissive in the bedroom when they have to be dominant in other aspects of their lives. Sex is an escape in a lot of ways (a good escape!), and it's nice to be able to let go and hand over the control to someone else for a while. I'm like that, myself.
But it's not true for everyone. There are also plenty of people who are dominant in all aspects of their lives, including their sexual ones. And there are people who are switch, and there are people who don't enjoy power exchanges in the bedroom at all, and want things to be totally equal. But it's not unusual at all to be submissive in the bedroom while you aren't elsewhere.