HELP! My boyfriends mom is a nut job!?

Me and my boyfriend have been going strong for nearly 10 months now. We are both 18. I know its not a very long time with someone, but our relationship is very strong and we are in love. We have an extreme amount of emotional support toward each other. We are more like best friends and lovers at the same time, than just two teenage kids going out. We have been through SO much together already, but we always lift each other up. He's my rock. And I am his. There's only one problem. His mother. She is a stay at home mom and has been for the past 18 years. She also has another 13 year old daughter. I understand that she had a bad childhood, her mom was a selfish woman. But I have lived with an abusive uncle and a pushover aunt most of my life, I even had malnutrition, and I turned it around to beign an AP and high honors student, and a cheerful person. She always smack talks about her mom, but they are exactly the same. Her son is 18, yet he is ont he tightest leash known to man. He still has a 12 AM curfew, the thing is, he lives far away from anyone. So it takes him an hour to get back home. So, he pretty much has to leave any place at 11. We can't even see a late night movie! She took away his phone, so for the past 9 months I have had to call her in order to talk to him. She won't let him use the computer or the internet. He baught his own car with his own money, but she's the one who signs the insurance check (even though her husbands the one paying for it) so she takes away his car as she pleases. She orders him around, and sits on facebook cafe games all day long. I put a picture of her in my private christmas album on facebook once for a duration of not even a day and she freaked out. She is not allowed to be seen because she is not pleased with her appearance. I get random yelling calls from her telling me I'm playing mind games and asking me where her son is, when he is at the store getting HER things, but he is 5 minutes late. She calls to complain and I have to listen for 30 minutes. When I call him, she talks to me yelling for a good 20 minutes and tells him to get off the phone after 5. She doesn't let him see me or go anywhere. Sometimes she makes him stay at home, jsut because, also telling him he can't go out last minute late on friday nights, so I'm then stuck at home with no plans (this happens ALL the time). Once, she sent him to the looney house for taking me out to dinner in his dads car. She controls everything and her husband works two jobs and pretty much stays out of it. My boyfriend does EVERYTHING for her. Around the house and so on. Her daughter won't even take out the trash. There's so much more to it but it angers me to just think about it. Pretty much, is there any way to calm her down? She's sending my boyfriend to a psychologist because "she won't have crazy in her house", when really, she's the one who desperately needs help. She did once, but she didn't like hearing the truth so she walked out on her first session and never came back. She disgusts me and I don't know how to take care of it. Help?