Probably an unusual question, but I have an unusual situation. I contacted the one professor I worked for, took multiple classes from, TA'd for etc back in October. She said she would be more than happy to write me letter. I haven't been able to get in contact with her for months, and my old school would not release any information. She is very old and I recently found out she is battling cancer. Of course, I don't expect her to write my letter now.

I have one solid letter from a prof, and I have a backup letter from my high school English teacher (the class was a college-in-the-high-school class, for what it's worth). Should I mention this stuff in an addenda? I recognize a letter from a high school teacher is probably a little lame, but I did write my optional essay about him. There is no other professor I was very close to/could expect a letter from in a short amount of time. Addenda or not to addenda?

Also, is it okay to mention multiple things in the addenda? I want to write about my upward GPA trend as well.

Thanks everybody!