Answer:
"at her altar's side"
Explanation:
This imagery would probably best reference religious rites. It can be said that Belinda's morning ritual, where she puts her make up on in front of her vanity, is a form of religious rite, though what she is worshiping as mentioned in the poem, is Pride - over her beauty. This poem was written by Alexander Pope, as part of his collection of poems, The R*ape of the Lock.