A Framingham woman has received a prison sentence for carrying out a COVID-19 business relief loan scheme that netted her over $450,000, according to the Massachusetts U.S. Attorney’s Office.Vanessa Nixon, 45, owner of Framingham real estate business Nixon Homes, pleaded guilty to one count of bank fraud in March after being charged in the case in February, the U.S. Attorney’s office said in a press release. Last week, a federal judge sentenced …