What do you do as a parent when one of your [ grown ] children becomes hostile?

My youngest daughter ( and my only biological daughter ) has recently, within the last few months, concluded that all of her “problems” are the result of my not having been a good father. She has stopped talking to me and won’t answer my emails. This from a girl with whom I thought I had a really great relationship, especially when we lived relatively close to one another. I SUSPECT that her mother ( my ex-wife ) has somehow managed to convince her that I am the source of all that is evil.

Any ideas about what I can do would be greatly appreciated. I love my children ( ages 37 – 47 ) very much, and this is causing me a great deal of anquish.