Where did Ruth Ann Schabacker write "Every day comes bearing its
gifts. Untie the ribbons."?

I have my doubts that Ruth Ann Schabacker was a real person, or at
least that she was the originator of this saying.  The only references
to her seem to be in connection with this quotation.  The same is true
for some other supposed originators of quotations.  See my comment on:

"Q: Who said it first?"
Google Answers
https://answers.google.com/answers/main?cmd=threadview&id=123060

I have the feeling that someone thought that a certain relative or
acquaintance had originated the quote, and thus attributed it to that
person; then other people assumed that this attribution was correct. 
Or, worse yet, someone simply made up the name.  I hope that I'm wrong
-- I'd be interested in the answer to this question myself!