She would traditionally be called the Maid of Honor (unmarried) or Matron of Honor (married or divorced).
If the main attendant to the bridesmaid is unmarried, she is known as the "maid of honour." If the main attendant is married, however, she is referred to as the "matron of honour."
An attendant in a royal palace is called an attendant or a servant.
unmarried bridesmaid married bridesmatron
equerry
attendant.
A bride.
The bride is sad about marrying someone who is not wealthy
No it is not offensive to call a person's wife 'his bride.' Sometimes couples have nicknames or endearing names to call their wife and calling her his bride is a compliment because she still feels appreciated by that comment. If she has told you she does not like you calling her 'bride' then please cease from doing so.
A kennel attendant.
A washroom attendant.
its called a Lady-in-waiting
Laundry Attendant