My first reaction was to never greet her again after all I'm a "bigz girlz" too...what's her story? Well her story was she was really having a rough time as a single parent coupled with other ...ishes! She may not be handling her "...ishes" well but that's not for you and I to judge but show Godly kindness and love.
I have learnt not everybody deserves a piece of your mind nor every situation your response. Everyone wants to be the "bigger person" well being the "bigger person" may require silence instead of a tirade of well intended advice/opinion, saying sorry when you are obviously wronged just to maintain peace. True maturity is not merely descriptive tag but a conscious act in the wake of touchy situations! that my friend takes Grace and wisdom. "A person's wisdom yield's wisdom but it's to your glory to overlook an offence" Proverbs 19:11.
The next time I ran into my friend at the bank, i walk up straight to her and said "hello". Despite her "...ishes" she smiled and said hello with gusto!