A Little Agency Melissa
I'm assuming you're referring to the TV series "A Little Bit of Heaven" or possibly "Little Agency" but I think you might be referring to Melissa George an Australian actress who played in the drama series "Mulheres de Areia" and then there was the series A Little Bit of Heaven which had a character called Melissa. However I found that A Little Bit Of Heaven had no main character called Melissa.
Initially portrayed as a "ladylike" and "classy" woman with strong morals. However, some readers find her character arc frustrating, noting that she can be prone to constant complaining and deceptive behavior as she juggles her two identities. A little agency melissa