Come on, keannu. "I loves her"? How does that sound to you? I know that the "as well as X" should be ignored in determining which verb to use, but how it sounds will affect what is actually said.
None of these will ever sound natural and the only way a native speaker would say them is if they started saying one thing thing (One of my friends) and then mentally switched gears and ended awkwardly.
Don't waste your time learning how to make these unnatural sentences.
I love her and so does one of my friends.
One of my friends loves her and so do I.
She is loved both by one of my friends and by me.
Student or Learner