Life must be very hectic for her, taking care of the new baby and of her spouse. I would cut her some slack. A new baby changes everything, and understandably, becomes the number one priority.

Sometimes one doesn't even have time to inform the rest of the family etc. let alone inform a client (as you said she would do with you).

If you don't hear from you, you could send a text to say 'hi. Hope all is well' but I wouldn't be accusatory e.g. 'where've you been?? you didn't text when you said you would!' etc.