Melpet wrote:
I think I figured out the phrase for my mother.
"Go deo gan choinioll"
If you see a problem there, please let me know.
However, help will still much be appreciated on the phrase about friendship lasting past this life.

Yes, but some spelling issues:
Go deo 's gan choinníoll [enlarged so that you can see the accent over the second "i" in the last word]
Forever and unconditionally
Forever and without condition(s)
The added
's [that's an apostrophe followed by the letter "s"] in the middle is a shortened form of the word for "and". You can also use
agus or
is, but I used the shortest form, given that you probably have space concerns (and it scans better, I think).