Welcome to the board, Abigail, and congratulations on the birth of your baby daughter, who I am sure is absolutely adorable.
I would not dream of altering her birth certificate (which sounds like it would be an expensive process).
I would tell my relations that that is how her lovely name is going to be spelt and pronounced, and if they don't like it they can go hang.
When Aleida is old enough she will decide for herself how she wants her name to be pronounced.
Student or Learner