Mommy Issues

My boyfriend mom stresses me out. She calls wanting him to do stuff for her everyday. She fusses at him about how we raise our kids and i feel we do a great job. She's always in our business she calls almost 5 times a day. Its starting to get annoying. I dont know how much more i can take. I want to say something to her but she doesn't understand I've been keeping my cool. What should i do ? Or should I just not let it phase me? I literally want to block her number from his phone but she will call on Facebook I'm sure.