Great question — answering as the UphillTech team:
On the chance that you might be mis-remembering some details... Erin Brockovich tells the true story of how an "unemployed single mother becomes a legal assistant and almost single-handedly brings down a California power company accused of polluting a city's water supply." The movie does not match your description exactly, but this plot description from Wikipedia seems kind of similar to your description: "Erin is given files for a real-estate case where Pacific Gas and Electric (PG&E) is offering to purchase the home of Hinkley, California, resident Donna Jensen. Erin is surprised to see medical records in the file and visits Donna, who explains that she had simply kept all her PG&E...
Full answer by Shiz Z.: https://movies.stackexchange.com/a/31217 (CC BY-SA 3.0).
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