I wouldn't get in touch at all with her just yet and leave it and get on with your own life. Go out and about with your own friends and leave her to get on with her life. If she hasn't phoned and it's always you phoning her first, then I would just leave it for a while.
I started to get very hacked off with most of my family as it was always me chasing them first, always seeing how they were. So I had a word with myself and left them all to it for a good while. Now it is far more balanced with certain members and others, like my mother and my daughter have been put on hold for now as no matter what I was doing, I was getting nowhere with them (similar personalities) and treated quite badly. I am not willing to be treated this way.
I do think that if we bring our children up to stand on their own two feet and create a life for themselves, do our best all their childhood to do this and probably go without ourselves and then get no thank you or care in return, then it is time to leave them to it and look after ourselves. If they cannot think that we deserve a little loving and attention as we get older and maybe more ill as we age, then I for one am not going to run after them begging for their time. I can get that off someone who does care.
Take a stand back, enjoy having a break from her, do your own thing. We bring them into the world but we don't have to checking up on them or them on us all the time. She will miss you soon enough.