not true...
actually he can change the map, and doesn't need 2 put up a vote. only shitty admins do that on a regular basis though, most admins will respect the fact they're not the only 1 on the server and put a vote up so others can have an opinion.
the senior admin does not have 2 offer a vote though, they can change the map provided they have senior admin. read the TOS...
she's just mad she didn't get her way, ignore her. you did nothing wrong.