I can understand how you feel. My DSs live quite near, but sometimes I do feel contact is only when it is convenient to them. We hardly ever talk on the phone, but do exchange texts.
I would agree that not to have been contacted for a month is hurtful, but I would send a text and mention your cataract surgery in a lighthearted way. She may be upset that you have not said anything before.
Like Rubylady said, we do bring our children up to be independent and quite rightly so. Time goes quickly for them if they have busy jobs and families.
It can be hurtful though, try not to dwell on it and enjoy the contact when it is made. x
Pre Warning re Tonight’s Eastenders