Glad all's well after the fall.
No, please don't pop in yet. Cold turkey is hard, but worth it, and it has the best chance of benefitting you both. If anything has actually happened to her, you'd have heard.
So, she is choosing not to contact you, not because she's so busy, but because she is punishing you again. Don't let her. The reason you are where you are now, is to learn new patterns, to concentrate on your dh and children, to protect them from her, and most of all to protect yourself. It isn't easy to change the habits of a lifetime, so it will be an effort to stop yourself worrying and to stop feeling guilty, but the harder you try now, the greater the pay-off in the end.
Always tell yourself that if she seriously needed help from you she'd have been in touch; as she hasn't been in touch, she has not seriously needed you. I suspect she is assuming that you will cave in very soon. See if you can make it a few days longer before you do.
It will get easier with time.
(I actually got on really well with my parents, and we would all have lunch every Sunday, but didn't phone at all unless there was something which couldn't wait. When we moved 7 years ago, we asked mum if she'd like to live with us - dad died years ago - so we ended up living together for about 5 years, until she died. DH adored her. She wasn't a manipulative woman though, was quite humble in a knew-what-she-was-worth-but-didn't-need-to-push-it sort of way, intelligent, cultured, funny, and fair. So, when I say phone once a week and visit once a month, this is observation of other's relationships with parents, and not reflective of my own.)