I think it's a good idea not to push too hard, since your mom isn't pushing you . . . yet. I would not be secretive about the joyful aspects of your new churchlife, but I wouldn't seek to "rub salt in the wound," either by initiating a lot of doctrinal discussions. Surely she will ask you something eventually. It seems like you have a good situation for now and opportunities may present themselves. Good luck with it.
I'm a little envious that your mom seems to be so cool and rational, unlike anyone in my immediate JW family, (although my grandma lets me come visit her and claims not to believe in the disfellowshipping nonsense, at least when her non-jw kids (my aunts & uncle) come to visit & make a little stink about it). It's "all or nothing," black and white, with the rest of them, though. Oh well. There's a chink in every JW family's armor, huh? Maybe your mom is it, the way my grandmom seems to be (Smiley). Hugs. I know it's hard, even in the best of JW family situations.