Your comments about friendship make me think of the song I learned when I was a Brownie:

"Make new friends and keep the old, one is silver and the other gold..."

I think of it this way, never turn your back on a friend. Yes, take a break if she is annoying you--if you care, you will revisit her later. When someone is really a friend, even if you haven't heard from them for decades, they are still someone, that, deep down, you just really like and respect in some sort of way. You reached out to them in the first place because they really are awesome in some sort of way....