I found this morbidly fascinating. To me the crux(es) of the issue are 1) what due diligence did you use regarding the $6M in funding, and 2) what contingencies did you use (should have used?) to safeguard your $120K in services?
Seeing a customer being unable to pay a supplier due to unforeseen business conditions seems very likely given the startup scenario you mention.
"Outing" her seems vindictive. I would instead try to introduce myself to her new investors assuming they can be IDd.
Sorry, man. $120K is a lot of breakfast tacos.