at what age she is ready?
what she wants to do before she gets married?
talk to her get married doesn't mean no freedom, still can go vacation and do a lot of things.
it is getting kids that will take away all the freedom.

I be honest, I've seen a lot of long time relationships break up.

For eg, I've got 2 classmates, they linked up in form 5, college, university, young working days...all of the sudden break up after 6 years.

Many years later, guy married another gal and migrated. And gal married a dentist and settled down in the north.

what's her excuse for waiting?

If TS is the love of her love, marry 22yo, 24yo, 26yo..also no difference.

unless she is thinking there is still hope for better ones.