I'm not exactly sure what you mean hun. Do you mean you have always put tips on and then the L+P? But now she just wants a natural nail overlay?
Yes it is ok to do this.
If she is a nail biter, she probably doesn't have any free edge. Does she want you to sculpt a free edge? If she just wants pink over her bitten nails they are obviously going to be short, but maybe this is what she wants to get out of the biting habit? However, if she has been biting when she's had the enhancements you've put on previously, just having an NNO is unlikely to stop her.
If you mean she wants to let her nails grow, you can still keep her enhancements on and let her nails grow, rebalancing and replacing the white whilst taking the length down each time by the amount it has grown. Eventually she will end up with an NNO as her natural nail grows under the enhancement, but will still have lovely looking nails during the time she is growing them.
HTH xx
