Adult Daughter Ghosting Me

I'm seeking advice on how to deal with my 24 year old daughter, who has become estranged from me.Her mother and I divorced when she was 9. Soon after, I moved 3000 miles away to pursue a business opportunity. That business was never a huge success, but it has kept me "trapped" on the west coast for the last 15 years.For many years my daughter visited me a few times per year and we maintained a long distance, but close relationship. When she turned 18 she stopped visiting me. About 3 years ago she stopped calling, but we still texted back and forth frequently. In the past year she has stopped answering my text messages, and won't answer her phone when I call.I know she's okay because I still communicate with her mother, but she doesn't know why my daughter is ghosting me. The last text I got from her was a quick "happy birthday dad" 6 months ago.I still text her a few times per week, and send her money frequently just in case she needs anything. I haven't remarried or have any other children. I understand I messed up by moving away when she was 9, and she's most likely still resentful over that, but I can't change the past. I can only try to be a better father in the future.Any advice on how to proceed? Should I leave her alone, or keep trying? At this point I feel embarrassed sending so many messages without getting a response.Thank you! via /r/Parenting https://ift.tt/2Qcgdo6