AW! Your mom sounds like she's projecting what she is feeling, that you won't be there to pick her up....
Congrats to you for getting on your way! Your mom is probably scared, but she will get over it. If she is possibly OCD then she will likely also have trouble with change. But this is such a good change. Stay the course and trust that she will be okay. Shut out any negative if you can & start looking forward to that bright future before you.
I wish you only the very best of luck!