You really dont need this additional stress, with all that you have going on. Friday would be quite soon enough to drop in, given that you were just there on Monday. Whatever you do decide, please dont make any firm days or times. You wont always want/be able to keep to them, and that will be another stick for her to beat you with. Anything you do decide to do, texting, calling, will quickly be seen as something she expects, so be very careful you dont set any precedents that you don`t want to keep up with. Once things have settled down, you can have a re-think.
I do understand the guilt, albeit very misplaced. Its learned behaviour, and its going to be very hard to unlearn. Just remember that whatever you do, your mother probably still wont be happy, so you might just as well do what suits you and your family. Having come this far, you really cant allow her an inch.