Chamber is from Old French; in other words, it's a word the Normans brought with them in 1066. Curse 'em!
The closest Old English is 'cofa' which is related to modern English, "coffin". Heh.
Other alternatives are naming the role for an aspect of it such as Cinderella; cinder girl.
I got it! Barmaid. What do you think?
EDIT: I just read your great post,
Nerindel:
chambermaid it is, unless you can think of a better.