Was I right in not unleashing my fury on a former tormentor?

This girl treated me horrible in 7th grade (the most awful school year ever) and even feigned a friendship. We haven't seen each other since freshman year.

Fast-forward to our Senior year of HS:

While I'm completing my community service hours on an elementary school (as part of the graduation requirement), I see her walk into the office with her mother. She now had a big belly and clearly with a sad expression. It seems like she might be 7-8 months pregnant and we're 17 year-olds.

We looked at each other briefly, then she looked down and left with her mother. That was my perfect chance to unleash my fury, pulled her aside in private to call her all the horrible names in the dictionary and then tell her mother how horrible I've been treated by her and her followers but I said nothing. I had no words to say, none but just think of it as poetic justice.

I got humiliated for an entire year just because I got sick with a cold. At least a year passes by quickly. She has to deal with being a single mother and be stuck with that for 18 years, lol. Was I right to say nothing or would you have said many things?

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For the first time, I didn't see her as the stuck-up nasty girl, as the tormentor but as a lost child, sad and depending on her mother for support.
Was I right in not unleashing my fury on a former tormentor?
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