Wow, that's alot of pennies
. That is one of the most snotty things I've ever seen someone do! I'm guessing this woman is more than a little passive aggressive! She's likely looking for some sort of reaction from you, just so that she can have the satisfaction of knowing she got back at you -- but don't let her have it! Don't contact her in any way. And the next time you see her, pretend everything is absolutely perfect, and thank her for getting the payment to you (with sincerity).
But whatever you do, don't give her the satisfaction.
And yeah, whoever suggested that you should use the money to treat yourself was right on. Do something nice for yourself!