I also started with play chips when I first started playing online poker. There are a lot of advantages to play chips. You get use to the poker site
interface. If you click on the wrong button, for example all-in instead of fold, it's no big deal. With real money, it is a mistake you don't want to make. It also gives you a good idea of the poker hands, the values of the hands, and how often you get really good hands. Again, better to learn this with play money.
I will still play a bit with play money when I download a poker room with a new interface just to get use to the graphics.
Once I was comfortable playing with people I didn't know, with the play money, I graduated to freerolls, and then to micro/low limit ring games, SnGs, and MTTs. I stayed playing freerolls until I had accumulated a small bankroll. I will stay at one limit until I feel comfortable moving up to a higher limit. I probably go a lot slower then most people because I don't have a lot of confidence in my game. But my confidence is improving as my bankroll goes up and as I make more final tables.
I think she should stay with the play chips until she feels comfortable to move on to the freerolls. But, she should also watch videos, read books, study, etc. even though she is just playing with play chips. She should continue to learn the game.