Someone mentally ill on benefits?

I have a friend who claims she is mentally ill, she doesnt think i care and doesnt want to c me anymore, she is taking 150 mg of something but she has been spotted laughing and joking with mates, wearing makeup, looking normal, her and her fella both dont work and have a kids under1 years old....i think she is on loads of benefits or something, what do u guys think, and does anyone know what benefits they could be getting and how much?