Thank you all for your responses. You are ALL correct, and I have thought of the various reasons, scenarios you've mentioned. I think AAAA is right, though, I HAVE bent over backwards, giving unconditional love that is rejected. And, yes, as Tishie suggest, I have thought of writing to her asking why she has distanced herself, but I fear alienating her further...but, then, I wonder how much more alienated could she be other than to stop communicating altogether, which may be her choice. Up to this point, I have done as Gimme has suggested, continuing to send love, because I DO love them all....sending expensive packages in hopes of receiving a reply, which then comes in the form of a polite, impersonal response.
Experience and age does give us some perspective, doesn't it? In my lifelong experience with rejection at the hands of loved ones, to whom I've given more than was appropriate, I've continued to pursue contact, realizing, in hindsight, that I should have ceased to behave in such a way. Silence, and self-care would have been a wiser choice. I think it is so also with my daughter, sadly. Rather than sending expensive packages, sending emails which I perceive to be a nuisance to her, perhaps I should just cease. If she chooses to contact me, then fine. On that note, asking her, confronting her, as to why she is alienated from me, would be further compromise of myself, as there really is NO reason for this behavior on her part.
The consolation I have in all of this, is the knowledge that she is happy with her life. She is happy in her marriage, and she and her husband are excellent parents. I do not need to worry about her welfare. Auburnsunshine has commented on the influence of "others," and this thought has occurred to me also, though there is no reason for it. I don't know.
I thank you all for your feedback...all wise and caring, which is what you find here on PC.
Much love and thanks,
Patty