maid-tron
A single mother who is chosen to occupy the maid-of-honor duties of a wedding. It is a combination of matron, which indicates having dignified woman that had children from wedlock, and maid, denoting her status as single, yet still innocent.
"The service for Tara's wedding was beautiful. Ashley was the maid-tron, her little girl was the flower girl and her little boy was the ring bearer. I'm so glad her loser ex-husband is out of the picture."