An object that simultaneously represents itself and something else.
Explanation:
Symbolism is a noun that means a system of symbols or form of expression that uses symbols to indicate facts and ideas. It can also be conceptualized as a system of symbols that allows us to represent a concept, a belief or an event, shown through something that represents itself and the other thing. This system works based on the association of ideas that promote the symbols and the networks of these that arise.
The speaker is the daughter of whom the poem is about. she is filled with admiration of her mother. And very thankful that her mother taught her English.