That's pretty sad. She may be controlling and simply want the best for you (note: she's a mother, it happens), but is that so wrong? You should feel blessed that you have a mother who gives a crap about you. She gave you life, raised you and I'm sure endured a ton of heartache along the way. Regardless what your relationship with her is, you should always treat her with love and respect. She probably just misses her son and being a mother to her once "baby". Maybe you should call her up and do something nice for/with her.
Just my two pennies.