My son has fairly recently moved into his own home, and on the odd occasion we feel a bit out touch (rare, as he phones several times a week), I think back to when I had first moved out, working full time and trying to sort out my own affairs and change of life, and remember how full-on daily pressure was.
As for the time of posting, when I was a full time working mum, that time of day I would have been taking my son to school or childminder in holidays, then driving to work, finding a parking space, and then at 8.30am dealing with the queue of colleagues, phone calls and emails! So it's possible your daughter didn't at that point have the personal space and quiet to contact you and her Dad, rather than it bring a deliberate omission.
Hope your husband is over the procedure, and any test results are good, and you can enjoy a get together with your daughter and her family.