RP, I've had times when i stopped speaking to my mother, although it was my choice. A lot of times it had to do with her not respecting my life choices. Most of the times these situations arose, when i felt that she wasn't listening to me, granted i probably wasn't listening to her either. Months later after we both had calmed down we were able to talk it out better. I hope that you and your mom resolve this soon, as it's never easy not being in contact w/a loved one.
Also i hope it didn't seem like i was trying to hijack the thread, i just thought that maybe my experiences could help shed some light.