it sounds like she is just really scared of losing you. SHe doesn't want to lose you like she lost your dad. Like Mrs P said sometimes we think we know more then our mothers and think we are tricking them. But they do have more experience and have a third eye.
For example I was taking birth control and "thought" that my mom didn't know. One day just out of the blue she was like "I know your having sex" At first I thought she was going to flip because sex before marriage was not cool in her book. We talked alittle but not much was said. I guess she understands.
I go to my mom and ask her opinion on things. That makes them feel needed. I think that she just really wants to be a part of your life and know what your up to. Not every detail must be reveled but moms have to know whats up.

you sound like you know what you need to do so do it!