From what I read in your post it is not that your alter is making another alter...... but rather that she is making a safe person/place to go too when she feels scared or frighten.

Example:
Like when I made a Victorian Home for all my little alters to go and be safe in...... my oldest alter (72 yrs old) watched over them and made them fresh cookies every day - and their beds were far up off the floor so no one could touch them while they were on the bed (their safe place).