Unfortunately it's now too late. The recruitment code has to be entered before any game time is purchased. By adding the game time it's negated the ability to add a recruitment code.

See: https://na.finalfantasyxiv.com/lodes...riend_recruit/

The recruitment code cannot be entered after a subscription has been established. Please be sure that the recruitment code is entered before then.
You could try contacting SE support to see if they'll add it since she's still in the first 30 days, but I wouldn't get your hopes up as the FAQ page also specifically says it won't work.

Sorry that I don't have a better reply