nanam it is your turn, to have some good quality of life before you get too old. Do it, go ahead with your own plans, dd will come around in her own time. Now stay back, you have told her and occupy yourself with taking the next step with your own happiness. She will come round once it sinks in, will have to do what many young families do and cut the cloth accordingly
Yes grandparents are often taken forgranted, I see old people shuffling around supermarkets, pushing a young child in a trolley while parent(s) at work. All too easy to get into that position, with it then being too difficult to wriggle out of it. The first no is the worst